Cyathus striatus
Encyclopedia
Cyathus striatus, commonly known as the fluted bird's nest, is a common saprobic bird's nest fungus with a widespread distribution throughout temperate
regions of the world. This fungus resembles a miniature bird's nest with numerous tiny "eggs"; the eggs, or peridioles, are actually lens-shaped bodies that contain spore
s. C. striatus can be distinguished from most other bird's nest fungi by its hairy exterior and grooved (striated) inner walls. Although most frequently found growing on dead wood in open forests, it also grows on wood chip mulch
in urban areas. The fruiting bodies
are encountered from summer until early winter. The color and size of this species can vary somewhat, but they are typically less than a centimeter wide and tall, and grey or brown in color. Another common name given to C. striatus, splash cups, alludes to the method of spore
dispersal: the sides of the cup are angled such that falling drops of water can dislodge the peridioles and eject them from the cup. The specific epithet is derived from the Latin stria, meaning "with fine ridges or grooves".
The "nest", or peridium
, is usually about 7 to 10 mm in height and 6 to 8 mm in width, but the size is somewhat variable and specimens have been found with heights and widths of up to 1.5 cm (0.590551181102362 in). The shape typically resembles a vase or inverted cone. The outer surface (exoperidium) ranges in color from slightly brownish to grayish buff to deep brown; the exoperidium has a shaggy or hairy texture (a tomentum), with the hairs mostly pointing downward. The inner surface of the peridium (the endoperidium) is striated or grooved, and shiny. Young specimens have a lid, technically called an epiphragm, a thin membrane that covers the cup opening. The epiphragm is hairy like the rest of the exoperidial surface, but the hairs often wear off leaving behind a thin white layer stretched across the lid of the cup. As the peridium matures and expands, this membrane breaks and falls off, exposing the peridioles within. The peridium is attached to its growing surface by a mass of closely packed hypha
e called an emplacement; in C. striatus the maximum diameter of the emplacement is typically 8–12 mm, and often incorporating small fragments of the growing surface into its structure.
Peridiole structure
The peridioles are about 1 to 1.5 mm wide and rarely up to 2 mm wide. They are disc-shaped, but may appear angular due to pressure from neighbouring peridioles. Peridioles may be dark, or a drab gray if still covered with a thin membrane called a tunica.
Peridioles in C. striatus are sheathed and attached to the endoperidium by complex cords of mycelia known as a funiculus
in the singular. The funiculus is differentiated into three regions: the basal piece, which attaches it to the inner wall of the peridium, the middle piece, and an upper sheath, called the purse, connected to the lower surface of the peridiole. Inside the purse and middle piece is a coiled thread of interwoven hyphae called the funicular cord, attached at one end to the peridiole and at the other end to an entangled mass of hyphae called the hapteron. When dry the funiculus is brittle, but when wet it is capable of long extension.
s measure about 15 to 20 µm long by 8 to 12 µm wide. They are elliptical, smooth, hyaline
, and notched at one end. During development, the spores are separated from the basidia when the latter collapse and gelatinize along with other cells lining the inner walls of the peridiole. The spores expand in size somewhat after being detached from the basidia.
under shrubs. The features of the microenvironment largely influence the appearance of C. striatus; all else being equal, it is more likely to be found in moist, shallow depressions than elevated areas. It is very widespread in temperate
areas throughout the world, growing in summer and fall.
Cyathus striatus can reproduce both asexually (via vegetative
spores), or sexually (with meiosis
), typical of taxa in the basidiomycetes that contain both haploid and diploid stages. Basidiospore
s produced in the peridioles each contain a single haploid nucleus
. After the spores have been dispersed into a suitable growing environment, they germinate and develop into homokaryotic
hyphae, with a single nucleus in each cell compartment. When two homokaryotic hypha
e of different mating compatibility groups
fuse with one another, they form a dikaryotic
mycelia in a process called plasmogamy
. After a period of time and under the appropriate environmental conditions, fruiting bodies may be formed from the dikaryotic mycelia. These fruiting bodies produce peridioles containing the basidia upon which new spores are made. Young basidia contain a pair of haploid sexually compatible nuclei which fuse, and the resulting diploid fusion nucleus undergoes meiosis to produce haploid basidiospores. The process of meiosis in C. striatus has been found to be similar to that of higher organisms.
). The peridioles degrade over time to eventually release the spores within, or they may be eaten by herbivorous animals and redeposited after passing through the digestive tract.
chemical compounds. It was first reported in 1971 to produce "indolic" substances (compounds with an indole
ring structure) as well as a complex of diterpenoid antibiotic
compounds collectively known as cyathins. Several years later, research revealed the indolic substances to be compounds now known as striatins. Striatins (A, B and C) have antibiotic activity against fungi imperfecti
, and various Gram-positive and -negative bacteria. C. striatus also produces sesquiterpene
compounds called schizandronols. It also contains the triterpene
compounds glochidone, glochidonol, glochidiol and glochidiol diacetate, cyathic acid, striatic acid, cyathadonic acid and epistriatic acid. The latter four compounds were unknown prior to their isolation from C. striatus.
Temperate
In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...
regions of the world. This fungus resembles a miniature bird's nest with numerous tiny "eggs"; the eggs, or peridioles, are actually lens-shaped bodies that contain spore
Spore
In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...
s. C. striatus can be distinguished from most other bird's nest fungi by its hairy exterior and grooved (striated) inner walls. Although most frequently found growing on dead wood in open forests, it also grows on wood chip mulch
Mulch
In agriculture and gardening, is a protective cover placed over the soil to retain moisture, reduce erosion, provide nutrients, and suppress weed growth and seed germination. Mulching in gardens and landscaping mimics the leaf cover that is found on forest floors....
in urban areas. The fruiting bodies
Sporocarp (fungi)
In fungi, the sporocarp is a multicellular structure on which spore-producing structures, such as basidia or asci, are borne...
are encountered from summer until early winter. The color and size of this species can vary somewhat, but they are typically less than a centimeter wide and tall, and grey or brown in color. Another common name given to C. striatus, splash cups, alludes to the method of spore
Spore
In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...
dispersal: the sides of the cup are angled such that falling drops of water can dislodge the peridioles and eject them from the cup. The specific epithet is derived from the Latin stria, meaning "with fine ridges or grooves".
Description
Peridium
The peridium is the protective layer that encloses a mass of spores in fungi. This outer covering is a distinctive feature of the Gasteromycetes.-Description:...
, is usually about 7 to 10 mm in height and 6 to 8 mm in width, but the size is somewhat variable and specimens have been found with heights and widths of up to 1.5 cm (0.590551181102362 in). The shape typically resembles a vase or inverted cone. The outer surface (exoperidium) ranges in color from slightly brownish to grayish buff to deep brown; the exoperidium has a shaggy or hairy texture (a tomentum), with the hairs mostly pointing downward. The inner surface of the peridium (the endoperidium) is striated or grooved, and shiny. Young specimens have a lid, technically called an epiphragm, a thin membrane that covers the cup opening. The epiphragm is hairy like the rest of the exoperidial surface, but the hairs often wear off leaving behind a thin white layer stretched across the lid of the cup. As the peridium matures and expands, this membrane breaks and falls off, exposing the peridioles within. The peridium is attached to its growing surface by a mass of closely packed hypha
Hypha
A hypha is a long, branching filamentous structure of a fungus, and also of unrelated Actinobacteria. In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium; yeasts are unicellular fungi that do not grow as hyphae.-Structure:A hypha consists of one or...
e called an emplacement; in C. striatus the maximum diameter of the emplacement is typically 8–12 mm, and often incorporating small fragments of the growing surface into its structure.
Peridiole structure
The peridioles are about 1 to 1.5 mm wide and rarely up to 2 mm wide. They are disc-shaped, but may appear angular due to pressure from neighbouring peridioles. Peridioles may be dark, or a drab gray if still covered with a thin membrane called a tunica.
Funiculus
The cerebrospinal fibers consist of numerous nerve fibers collected together and enclosed in membranous sheaths. A small bundle of fibers, enclosed in a tubular sheath, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are...
in the singular. The funiculus is differentiated into three regions: the basal piece, which attaches it to the inner wall of the peridium, the middle piece, and an upper sheath, called the purse, connected to the lower surface of the peridiole. Inside the purse and middle piece is a coiled thread of interwoven hyphae called the funicular cord, attached at one end to the peridiole and at the other end to an entangled mass of hyphae called the hapteron. When dry the funiculus is brittle, but when wet it is capable of long extension.
Microscopic characteristics
The basidia, the spore-bearing cells, are club-shaped with long stalks. They typically hold 4 spores that are sessile, that is, attached directly to the surface of the basidium, rather than by a short stalk (a sterigmata). SporeSpore
In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...
s measure about 15 to 20 µm long by 8 to 12 µm wide. They are elliptical, smooth, hyaline
Hyaline
The term hyaline denotes a substance with a glass-like appearance.-Histopathology:In histopathological medical usage, a hyaline substance appears glassy and pink after being stained with haematoxylin and eosin — usually it is an acellular, proteinaceous material...
, and notched at one end. During development, the spores are separated from the basidia when the latter collapse and gelatinize along with other cells lining the inner walls of the peridiole. The spores expand in size somewhat after being detached from the basidia.
Habitat and distribution
Cyathus striatus is a saprobic fungus, deriving its nutrition from decaying organic material, and is typically found growing in clusters on small twigs or other woody debris. It is also common on mulchMulch
In agriculture and gardening, is a protective cover placed over the soil to retain moisture, reduce erosion, provide nutrients, and suppress weed growth and seed germination. Mulching in gardens and landscaping mimics the leaf cover that is found on forest floors....
under shrubs. The features of the microenvironment largely influence the appearance of C. striatus; all else being equal, it is more likely to be found in moist, shallow depressions than elevated areas. It is very widespread in temperate
Temperate
In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...
areas throughout the world, growing in summer and fall.
Life cycle
Vegetative reproduction
Vegetative reproduction is a form of asexual reproduction in plants. It is a process by which new individuals arise without production of seeds or spores...
spores), or sexually (with meiosis
Meiosis
Meiosis is a special type of cell division necessary for sexual reproduction. The cells produced by meiosis are gametes or spores. The animals' gametes are called sperm and egg cells....
), typical of taxa in the basidiomycetes that contain both haploid and diploid stages. Basidiospore
Basidiospore
A basidiospore is a reproductive spore produced by Basidiomycete fungi. Basidiospores typically each contain one haploid nucleus that is the product of meiosis, and they are produced by specialized fungal cells called basidia. In grills under a cap of one common species in the phylum of...
s produced in the peridioles each contain a single haploid nucleus
Cell nucleus
In cell biology, the nucleus is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these...
. After the spores have been dispersed into a suitable growing environment, they germinate and develop into homokaryotic
Homokaryotic
Homokaryotic refers to multinucleate cells where all nuclei are genetically identical. It is the antonym of heterokaryotic....
hyphae, with a single nucleus in each cell compartment. When two homokaryotic hypha
Hypha
A hypha is a long, branching filamentous structure of a fungus, and also of unrelated Actinobacteria. In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium; yeasts are unicellular fungi that do not grow as hyphae.-Structure:A hypha consists of one or...
e of different mating compatibility groups
Mating type
Mating types occur in eukaryotes that undergo sexual reproduction via isogamy. Since the gametes of different mating types look alike, they are often referred to by numbers, letters, or simply "+" and "-" instead of "male" and "female." Mating can only take place between different mating...
fuse with one another, they form a dikaryotic
Dikaryon
Dikaryon is from Greek, di meaning 2 and karyon meaning nut, referring to the cell nucleus.The dikaryon is a nuclear feature which is unique to some fungi, in which after plasmogamy the two compatible nuclei of two cells pair off and cohabit without karyogamy within the cells of the hyphae,...
mycelia in a process called plasmogamy
Plasmogamy
Plasmogamy is a stage in the sexual reproduction of fungi. In this stage, the cytoplasm of two parent mycelia fuse together without the fusion of nuclei, as occurs in higher terrestrial fungi. After plasmogamy occurs, the secondary mycelium forms. The secondary mycelium consists of dikaryotic...
. After a period of time and under the appropriate environmental conditions, fruiting bodies may be formed from the dikaryotic mycelia. These fruiting bodies produce peridioles containing the basidia upon which new spores are made. Young basidia contain a pair of haploid sexually compatible nuclei which fuse, and the resulting diploid fusion nucleus undergoes meiosis to produce haploid basidiospores. The process of meiosis in C. striatus has been found to be similar to that of higher organisms.
Spore dispersal
The cone shaped fruiting body of Cyathus striatus makes use of a splash-cup mechanism to help disperse the spores. When a raindrop hits the interior of the cup with the optimal angle and velocity, the downward force of the water ejects the peridioles into the air. The force of ejection rips open the funiculus, releasing the tightly wound funicular cord. The hapteron attached to the end of the funiculus is adhesive, and when it contacts a nearby plant stem or stick, the hapteron sticks to it; the funicular cord wraps around the stem or stick powered by the force of the still-moving peridiole (similar to a tetherballTetherball
Tetherball is a North American game for two opposing players. The equipment consists of a stationary metal pole, from which is hung a volleyball from a rope, or tether. The two players stand on opposite sides of the pole. Each player tries to hit the ball one way; one clockwise, and one...
). The peridioles degrade over time to eventually release the spores within, or they may be eaten by herbivorous animals and redeposited after passing through the digestive tract.
Bioactive compounds
Cyathus striatus has proven to be a rich source of bioactiveNatural product
A natural product is a chemical compound or substance produced by a living organism - found in nature that usually has a pharmacological or biological activity for use in pharmaceutical drug discovery and drug design...
chemical compounds. It was first reported in 1971 to produce "indolic" substances (compounds with an indole
Indole
Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. Indole is a popular component of fragrances and the precursor to many pharmaceuticals. Compounds that contain an...
ring structure) as well as a complex of diterpenoid antibiotic
Antibiotic
An antibacterial is a compound or substance that kills or slows down the growth of bacteria.The term is often used synonymously with the term antibiotic; today, however, with increased knowledge of the causative agents of various infectious diseases, antibiotic has come to denote a broader range of...
compounds collectively known as cyathins. Several years later, research revealed the indolic substances to be compounds now known as striatins. Striatins (A, B and C) have antibiotic activity against fungi imperfecti
Fungi imperfecti
The Fungi imperfecti or imperfect fungi, also known as Deuteromycota, are fungi which do not fit into the commonly established taxonomic classifications of fungi that are based on biological species concepts or morphological characteristics of sexual structures because their sexual form of...
, and various Gram-positive and -negative bacteria. C. striatus also produces sesquiterpene
Sesquiterpene
Sesquiterpenes are a class of terpenes that consist of three isoprene units and have the molecular formula C15H24. Like monoterpenes, sesquiterpenes may be acyclic or contain rings, including many unique combinations...
compounds called schizandronols. It also contains the triterpene
Triterpene
Triterpenes are terpenes consisting of six isoprene units and have the molecular formula C30H48.The pentacyclic triterpenes can be classified into lupane, oleanane or ursane groups.Animal- and plant-derived triterpenes exist, such as:*squalene...
compounds glochidone, glochidonol, glochidiol and glochidiol diacetate, cyathic acid, striatic acid, cyathadonic acid and epistriatic acid. The latter four compounds were unknown prior to their isolation from C. striatus.
Cited text
External links
- Mushroom Expert Profile
- Tom Volk's Fungi Description and ecology
- Medicinal Mushrooms Bioactive compounds and medicinal properties