Boletus porosporus
Encyclopedia
Boletus porosporus is a small wild mushroom in the Boletaceae
family. These mushrooms have tubes and pores instead of gills beneath their caps
. It is commonly known as the sepia bolete.
are up to 8 centimetres (3.1 in) in diameter, and are soon cracked or fissured. Varying in colour from putty beige to dull brown, or olivaceous.
The stem
is usually with very little red, and is olivaceous, more yellow at the apex, and bruises brown. The flesh is pale lemon yellow or buff in the cap, and chrome yellow in the stem apex. It darkens to dark brick or vinaceous towards the base. The tubes are 13 to 20 cm (5.1 to 7.9 in) long, initially lemon yellow, later olivaceous, and they bruise bluish. The pores are narrow, 0.2–0.5 mm in diameter, angular, lemon yellow, and darken later. They also bruise blue. The spores give an olive-brown spore print
. At microscopic level this bolete has truncate (chopped off) spores; the spore dimensions are 13–15 by 4–5 µm
.
woods, particularly with oak
, hornbeams, and beech
. This species is widespread in northern temperate zones, but somewhat rare in Europe.
Boletaceae
Boletaceae are a family of mushrooms, primarily characterized by developing their spores in small pores on the underside of the mushroom, instead of gills, as are found in agarics. Nearly as widely distributed as agarics, they include the Cep or King Bolete , much sought after by mushroom hunters...
family. These mushrooms have tubes and pores instead of gills beneath their caps
Pileus (mycology)
The pileus is the technical name for the cap, or cap-like part, of a basidiocarp or ascocarp that supports a spore-bearing surface, the hymenium. The hymenium may consist of lamellae, tubes, or teeth, on the underside of the pileus...
. It is commonly known as the sepia bolete.
Taxonomy
This species was previously known as Xerocomus porosporus; the genus Xerocomus is now reduced to synonymy with Boletus.Description
When fully expanded, the capsPileus (mycology)
The pileus is the technical name for the cap, or cap-like part, of a basidiocarp or ascocarp that supports a spore-bearing surface, the hymenium. The hymenium may consist of lamellae, tubes, or teeth, on the underside of the pileus...
are up to 8 centimetres (3.1 in) in diameter, and are soon cracked or fissured. Varying in colour from putty beige to dull brown, or olivaceous.
The stem
Stipe (mycology)
thumb|150px|right|Diagram of a [[basidiomycete]] stipe with an [[annulus |annulus]] and [[volva |volva]]In mycology a stipe refers to the stem or stalk-like feature supporting the cap of a mushroom. Like all tissues of the mushroom other than the hymenium, the stipe is composed of sterile hyphal...
is usually with very little red, and is olivaceous, more yellow at the apex, and bruises brown. The flesh is pale lemon yellow or buff in the cap, and chrome yellow in the stem apex. It darkens to dark brick or vinaceous towards the base. The tubes are 13 to 20 cm (5.1 to 7.9 in) long, initially lemon yellow, later olivaceous, and they bruise bluish. The pores are narrow, 0.2–0.5 mm in diameter, angular, lemon yellow, and darken later. They also bruise blue. The spores give an olive-brown spore print
Spore print
thumb|300px|right|Making a spore print of the mushroom Volvariella volvacea shown in composite: mushroom cap laid on white and dark paper; cap removed after 24 hours showing pinkish-tan spore print...
. At microscopic level this bolete has truncate (chopped off) spores; the spore dimensions are 13–15 by 4–5 µm
Micrometre
A micrometer , is by definition 1×10-6 of a meter .In plain English, it means one-millionth of a meter . Its unit symbol in the International System of Units is μm...
.
Distribution and habitat
B. porosporus appears occasionally in the autumn, and grows singly or in small groups in mixed deciduousDeciduous
Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...
woods, particularly with oak
Oak
An oak is a tree or shrub in the genus Quercus , of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus...
, hornbeams, and beech
Beech
Beech is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe, Asia and North America.-Habit:...
. This species is widespread in northern temperate zones, but somewhat rare in Europe.