Botryococcus

Botryococcus is a genus of green algae. The cells form an irregularly shaped aggregate. Thin filaments connect the cells. The cell body is ovoid, 6 to 10 μm long, and 3 to 6 μm wide. Fossils of the genus are known since Precambrian times, and form the single largest biological contributor to crude oil, and are a major component of oil shales.

Taxonomy
The genus and its holotype were described in 1849 by Friedrich Traugott Kützing.

Description
Appears as colonies of cells irregularly arranges cells in a folded mucilage. Cells spherical or oval, chloroplast net-like with a single pyrenoid.

Ecology
The algae is frequently found in plankton in waters with differing characteristics and a wide geographic distribution. It is an important component of algal blooms and the discoloration of water. It is known to reproduce asexually but zoospores and sexual reproduction are unknown.

Species
There are 13 accepted species in the genus.
 * Botryococcus australis
 * Botryococcus balkachicus
 * Botryococcus braunii
 * Botryococcus calcareus
 * Botryococcus canadensis
 * Botryococcus comperei
 * Botryococcus fernandoi
 * Botryococcus neglectus
 * Botryococcus pila
 * Botryococcus protuberans
 * Botryococcus pusillus
 * Botryococcus terribilis
 * Botryococcus terricola