. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . B Fig. 201. Three apical cells of Trentepohlia Montis-Tabulse- (Reinsch) De Toni var. ceylanicaW. & G. S. West showing a series of apical caps (ap. cp.). In C the serrated fringe of aloose cap is well shown, x 800 (after West & Hood). zoogonidangium, which is always terminal on a branch. The upper part of the terminalcell becomes funnel-shaped by the formation of a subapical constriction and the dilationof the apex, after which it is cut oft
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . B Fig. 201. Three apical cells of Trentepohlia Montis-Tabulse- (Reinsch) De Toni var. ceylanicaW. & G. S. West showing a series of apical caps (ap. cp.). In C the serrated fringe of aloose cap is well shown, x 800 (after West & Hood). zoogonidangium, which is always terminal on a branch. The upper part of the terminalcell becomes funnel-shaped by the formation of a subapical constriction and the dilationof the apex, after which it is cut oft by a wall on which two annular thickenings aredeveloped, one over the other. These ring-like thickenings eventually cause the de-tachment of the zoogonidangium before the escape of the zoogonidia. In Phycopeltis the zoogonidangia are borne singly on short stalks of oneto six cells, which stand erect from the disc, although the actual supporting-cell may be hooked. In Cephaleuros they occur mostly in small clusters atthe ends of erect cellular hairs. On becoming wet they rupture and setfree the biciliated zoogonidia, but as in Trentepohlia
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