Description: Conococcus elongatus H.J.Carter = Micractinium elongatum (H.J.Carter) Hegewald & Schnepf. Date: 1869. Source: Carter, H.J. 1869. A description, with illustrations, of the development of Sorastrum spinulosum Näg.; to which is added that of a new form of Protococcus. Annals and Magazine of Natural History, series 4 4: 420–435. plate XIV: figs 10, 11. https://www.biodiversitylibrary.org/page/27735304 (cropped for figs 10, 11). Author: Herbert James Carter (1858–1940). Permission(Reusing this file): : This file comes from the Biodiversity Heritage Library. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Deutsch | English | español | français | italiano | македонски | Nederlands | polski | +/−.
Micractinium pusillum (Fresenius,1858). Usually found in four-celled colonies (only three of the four cells of this colony are seen here). Each cell has two to seven long, delicate setae. Each cell has one cup-shaped plastid with a pyrenoid. 18S ribosomal RNA gene studies place this genus in the Trebouxiophyceae. One of the distinguishing features of trebouxiophytes is metacentric mitosis in which centrioles are located near the metaphase plate of the chromosomes rather than at the spindle poles. Other characteristics include formation of microtubules parallel to the dividing cell wall during cytokinesis (phycoplast). The similar genus, Errerella, has only one spine per cell.Collected from a freshwater pond near Boise, Idaho. July 2005. Phase contrast.
