Identifier: algvolimyxophy00west Title: Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ Year: 1916 (1910s) Authors: West, G. S. (George Stephen), 1876-1919 Subjects: Algae Publisher: Cambridge [Eng.] The University press Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book

Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image: ed to show that Sphserocysti* (Chodat, 1902) should be regardedas synonymous with Glceococcus (A. Braun, 1851), but Chodat (04) has rightly contested thissuggestion. The microscopic limnetic colonies of Splmrocystis have nothing whatever incommon with Brauns description of the macroscopic colonies of Glceococcus, which must beplaced in the category of genera dubia. Willes reference of the genus to the Chlamydomonadeae(Wille, 03; 09) is also erroneous since the dominant vegetative phase is non-motile, and theexperience of the present author is that a motile phase may be absent for very numerousgenerations. Tetrasporeae 187 Sub-family TETRASPORE/E. The Algae comprised in this group are dis-tinguished from all other members of the Palmellaceae by the possession of pseudocilia. These are motionless, functionless cilia, each mature cell beingprovided with two or more. In Tetraspora the cells are largely grouped infours at the periphery of a more or less extensive (macroscopic) mucilaginous

Text Appearing After Image: Fig. 113. A-G, Schizochlamys gelatinosa A. Br. A, vegetative cell showing pseudocilia, ×625; B, cell showing ecdysis of outer layers of wall, ×415; C and D, formation of zoogonidia, ×625; E, zoogonidium, ×830; F and G, zoogonidium changing to Schizochlamys-cell, ×830. H and I, Apiocystis brauniana Näg. H, pear-shaped colony, ×430; I, three cells showing pseudocilia, b, two daughter-cells from a division, the second pseudocilium not yet developed, ×860. J, Tetraspora gelatinosa (Vauch.) Desv., periphery of colony showing a few of the cells with their pseudocilia, × about 900. cv, contractile vacuole; n, nucleus; ol, oil globule; ps.c., pseudocilia; py, pyrenoid ; sf, stigma (or pigment-spot). (A-G, after Scherffel; J, after Chodat.) colony. The cells multiply by repeated division, chiefly in two directions inone plane, with the conversion of the walls of the mother-cells into mucilage.The pseudocilia are embedded in the mucilage of the colony (fig. 113 J), andeach cell is o

Note About Images