A genus is a taxonomic rank used in the biological classification of living and fossil organisms, as well as viruses, in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.
Wittrockiella is a genus of green algae in the family Pithophoraceae. This genus was first described by Nordal Wille in 1909.
Pyrenomonas is a genus of cryptomonad.
Scytonema is a genus of photosynthetic cyanobacteria that contains over 100 species. It grows in filaments that form dark mats. Many species are aquatic and are either free-floating or grow attached to a submerged substrate, while others species grow on terrestrial rocks, wood, soil, or plants. Scytonema is a nitrogen fixer, and can provide fixed nitrogen to the leaves of plants on which it is growing. Some species of Scytonema form a symbiotic relationship with fungi to produce a lichen.
Palmaria is a genus of algae. One of its most notable members is dulse, Palmaria palmata.
Woronichinia is a genus of cyanobacteria, belonging to the family Coelosphaeriaceae.
Thalassiothrix is a genus of Chromista belonging to the family Thalassionemataceae.
Tolypella is a genus of green algae belonging to the family Characeae.
Achnanthes is a genus of diatoms belonging to the family Achnanthaceae.
Achnanthidium is a genus of diatoms belonging to the family Achnanthidiaceae.
Achroonema is a genus of bacteria with uncertain systematics.
Actinoptychus is a genus of diatoms belonging to the family Heliopeltaceae.
Anathece is a genus of cyanobacteria belonging to the family Synechococcaceae.
Lichenoconium is a genus of fungi with unknown belonging to the family Lichenoconiaceae.
Eucnecosum is a genus of beetles belonging to the family Staphylinidae.
Eucocconeis is a genus of diatoms belonging to the family Achnanthidiaceae.
Geitlerinema is a genus of cyanobacteria belonging to the family Coleofasciculaceae.
Gloeocapsopsis is a genus of cyanobacteria belonging to the family Chroococcaceae.
Gomphosphaeria is a genus of cyanobacteria belonging to the family Gomphosphaeriaceae.
Dolichospermum flosaquae is a species of Cyanobacteria belonging to the family Aphanizomenonaceae.
