Oscillatoria is a genus of filamentous cyanobacterium which is often found in freshwater environments, such as hot springs, and appears blue-green. Its name refers to the oscillating motion of its filaments as they slide against each other to position the colony facing a light source. Oscillatoria reproduces by fragmentation, facilitated by dead cells which separate a filament into separate sections, or hormogonia, which then grow. Oscillatoria uses photosynthesis to survive and reproduce. Each filament of oscillatoria consists of trichome which is made up of rows of cells. The tip of the trichome oscillates like a pendulum. In reproduction, it takes place by vegetative means only. Usually the filament breaks into a number of fragments called hormogonia. Each hormogonium consist of one or more cells and grow into a filament by cell division in one direction.
Craticula is a genus of diatom that lies on or in the top layers of sediments in the freshwater to brackish water environments it inhabits. In addition to frustule morphology the genus differs from closely related species by its sexual reproduction and movement in response to light.
Bangia is an extant genus of division Rhodophyta that grows in marine or freshwater habitats. Bangia has small thalli with rapid growth and high reproductive output, and exhibits behavior characteristic of r-selected species. The plants are attached by down-growing rhizoids, usually in dense purple-black to rust-colored clumps. The chloroplasts of Bangia, like others in the division Rhodophyta, contain chlorophyll a and sometimes chlorophyll d, as well as accessory pigments such as phycobilin pigments and xanthophylls. Depending on the relative proportions of these pigments and the light conditions, the overall color of the plant can range from green to red to purple to grey; however, the red pigment, phycoerythrin, is usually dominant.
Sirogonium is a genus of filamentous charophyte green algae of the order Zygnematales. It is found in freshwater areas on all continents but Antarctica. Spirogyra measures approximately 32–115 μm in width. Each cell contains 2–10 chloroplasts in a ribbon, in contrast to the closely related genus Spirogyra, which has chloroplasts in a coil.
Stylobryon is a monotypic genus of golden algae in the family Dinobryaceae. It has one known species Stylobryon insignisFromental, 1874.
Navicula cari is a species of algae in the genus Navicula. Navicula cari occur in eutrophic waters.
Palmaria is a genus of algae. One of its most notable members is dulse, Palmaria palmata.
Thalassiothrix is a genus of Chromista belonging to the family Thalassionemataceae.
Achnanthes is a genus of diatoms belonging to the family Achnanthaceae.
Achroonema is a genus of bacteria with uncertain systematics.
Amphipleura is a genus of diatoms belonging to the family Amphipleuraceae.
Eucapsis is a genus of cyanobacteria belonging to the family Merismopediaceae.
Eucocconeis is a genus of diatoms belonging to the family Achnanthidiaceae.
Gomphosphaeria is a genus of cyanobacteria belonging to the family Gomphosphaeriaceae.
Halamphora coffeiformis is a species of diatoms belonging to the family Amphipleuraceae.
Spicaticribra is a genus of diatoms belonging to the family Stephanodiscaceae.
Epithemia is a genus of diatoms belonging to the family Rhopalodiaceae.
Gomphonema is a genus of diatoms belonging to the family Gomphonemataceae.
Prasiola calophylla is a species of algae.
Pseudorhizoclonium is a genus of algae in the Cladophoraceae family.
