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Planktosphaeria is a genus of Chlorophyceae of the green algae. [1] It was first described by the phycologist Gilbert Morgan Smith in 1918, with Planktosphaeria gelatinosa as its type species . Species of Planktosphaeria are commonly found in freshwater plankton around the world.
Pelagophyceae is a class of heterokont algae. It is the sister group of the Dictyochophyceae. [2] All known species are marine. They can be single-celled (coccoid or flagellate), palmelloid or filamentous. Some members (Pelagomonas) belong to picoplankton, and some other (Sarcinochrysis) are macroscopic attached organisms. [3]
The Smith system, published in 1938 by American botanist Gilbert Morgan Smith, distinguished two classes: Chlorophyceae, which contained all green algae (unicellular and multicellular) that did not grow through an apical cell; and Charophyceae, which contained only multicellular green algae that grew via an apical cell and had special sterile ...
Gilbert Morgan Smith (6 January 1885, Beloit, Wisconsin – 11 July 1959) was a botanist and phycologist, who worked primarily on the algae.He was best known for his books, particularly the Freshwater Algae of the United States, the Marine Algae of the Monterey Peninsula and the two volumes of Cryptogamic Botany.
The Hoek, Mann and Jahns system is a system of taxonomy of algae. It was first published in Algae: An Introduction to Phycology by Cambridge University Press in 1995. Division Cyanophyta (= Cyanobacteria)
Pleodorina is a genus of colonial green algae in the family Volvocaceae. [2] Description by Gilbert M. Smith (1920, pp 96–97). [1]Pleodorina Shaw 1894: . Colonies always motile; spherical to sub-spherical, with 32-128 cells lying some distance from one another just within the periphery of the homogeneous, hyaline, gelatinous, colonial envelope and not connected by cytoplasmic strands.
The initial targets of Cavalier-Smith's classification, the protozoa were classified as members of the animal kingdom, [12] and many algae were regarded as part of the plant kingdom. With growing awareness that the animals and plants embraced unrelated taxa, the use of the two kingdom system was rejected by specialists.