The following is a list of the "B" codes for MeSH

Mesh

Mesh consists of semi-permeable barrier made of connected strands of metal, fiber, or other flexible/ductile material. Mesh is similar to web or net in that it has many attached or woven strands.-Types of mesh:...

. It is a product of the United States National Library of Medicine

United States National Library of Medicine

The United States National Library of Medicine , operated by the United States federal government, is the world's largest medical library. Located in Bethesda, Maryland, the NLM is a division of the National Institutes of Health...

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Source for content is here. (File "2006 MeSH Trees".)

--- algae, brown

--- ascophyllum --- fucus

Fucus

Fucus is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world.-Description and life cycle:...

 --- kelp

Kelp

Kelps are large seaweeds belonging to the brown algae in the order Laminariales. There are about 30 different genera....

 --- laminaria

Laminaria

Laminaria is a genus of 31 species of brown algae , all sharing the common name "kelp". This economically important genus is characterized by long, leathery laminae and relatively large size. Some species are referred to by the common name Devil's apron, due to their shape, or sea colander, due to...

 --- macrocystis

Macrocystis

Macrocystis is a genus of kelp . This genus contains the largest of all the phaeophyceae or brown algae. Macrocystis has pneumatocysts at the base of its blades. Sporophytes are perennial, and individual stipes may persist for many years...

 --- sargassum

Sargassum

Sargassum is a genus of brown macroalga in the order Fucales. Numerous species are distributed throughout the temperate and tropical oceans of the world, where they generally inhabit shallow water and coral reefs. However, the genus may be best known for its planktonic species...

 --- undaria

Undaria

Undaria is a genus of kelp which includes Undaria pinnatifida ....

--- algae, green

--- acetabularia

Acetabularia

Acetabularia is a genus of green algae, specifically of the Polyphysaceae family, Typically found in subtropical waters, Acetabularia is a single-celled organism, but gigantic in size and complex in form, making it an excellent model organism for studying cell biology...

 --- caulerpa

Caulerpa

Caulerpa is a genus of seaweeds in the family Caulerpaceae . They are unusual because they consist of only one cell with many nuclei, making them among the biggest single cells in the world...

 --- chlamydomonas

Chlamydomonas

Chlamydomonas is a genus of green algae. They are unicellular flagellates. Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogenesis, and genetics...

 --- chlamydomonas reinhardtii

Chlamydomonas reinhardtii

Chlamydomonas reinhardtii is a single celled green alga about 10 micrometres in diameter that swims with two flagella. They have a cell wall made of hydroxyproline-rich glycoproteins, a large cup-shaped chloroplast, a large pyrenoid, and an "eyespot" that senses light.Although widely distributed...

 --- chlorella

Chlorella

Chlorella is a genus of single-celled green algae, belonging to the phylum Chlorophyta. It is spherical in shape, about 2 to 10 μm in diameter, and is without flagella. Chlorella contains the green photosynthetic pigments chlorophyll-a and -b in its chloroplast...

 --- chlorella vulgaris --- prototheca

Prototheca

In taxonomy, Prototheca is a genus of algae, specifically of the Chlorellaceae. Some species can cause the disease protothecosis.-Scientific databases:* * *...

 --- scenedesmus

Scenedesmus

Scenedesmus is a genus of algae, specifically of the Chlorophyceae. They are colonial and non-motile....

 --- ulva

Ulva

Ulva is an island in the Inner Hebrides of Scotland, off the west coast of Mull. It is separated from Mull by a narrow strait, and connected to the neighbouring island of Gometra by a bridge. Much of the island is formed from Tertiary basalt rocks, which is formed into columns in places.Ulva has...

 --- volvox

Volvox

Volvox is a genus of chlorophytes, a type of green algae. It forms spherical colonies of up to 50,000 cells. They live in a variety of freshwater habitats, and were first reported by Antonie van Leeuwenhoek in 1700. Volvox developed its colonial lifestyle .-Description:Volvox is the most developed...

--- algae, red

--- chondrus

Chondrus

Chondrus is a genus of red alga whose most famous species is C. crispus....

 --- gracilaria

Gracilaria

Gracilaria is a genus of red algae notable for its economic importance as an agarophyte, as well as its use as a food for humans and various species of shellfish...

 --- laurencia --- plocamium --- porphyra

Porphyra

Porphyra is a foliose red algal genus of laver, comprising approximately 70 species. It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans. In East Asia, it is used to produce the sea vegetable products nori and gim ,...

 --- porphyridium

--- euglenida

--- euglena

Euglena

Euglena is a genus of unicellular flagellate protists. It is the best known and most widely studied member of the phylum Euglenozoa , a diverse group containing some 44 genera and at least 800 species. Species of Euglena are found in fresh and salt waters...

 --- euglena gracilis --- euglena longa

--- oomycetes

--- achlya

Achlya

Achlya is a genus of water mould....

 --- aphanomyces --- lagenidium

Lagenidium

Lagenidium is a genus of Oomycota. It includes the biological control agent Lagenidium giganteum.Certain species can cause lagenidiosis....

 --- peronospora

Peronospora

Peronospora is a genus of plant pathogens, belonging to the class of water moulds. Water moulds are not true fungi since they belong to the kingdom of chromalveolates....

 --- phytophthora

Phytophthora

Phytophthora is a genus of plant-damaging Oomycetes , whose member species are capable of causing enormous economic losses on crops worldwide, as well as environmental damage in natural ecosystems. The genus was first described by Heinrich Anton de Bary in 1875...

 --- pythium

Pythium

Pythium is a genus of parasitic oomycete. Most species are plant parasites, but Pythium insidiosum is an important pathogen of animals...

 --- saprolegnia

Saprolegnia

Saprolegnia is a genus of freshwater mould often called a "cotton mould" because of the characteristic white or grey fibrous patches it forms. Current taxonomy puts Saprolegnia as a genus of the heterokonts in the order Saprolegniales.-Habits:...