. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . y the penultimate cell assuming thefunction of an apical cell and growing upwards through the base of the oldzoogonidangium, which it leaves behind as a sort of collar. The zoogonidangiaare mostly ellipsoid or ovoid, usually sessile, but sometimes stalked, and theyopen by a terminal or subterminal pore. Brand (10) states that there are three types of zoogonidangia differentiated as follows :(1) the sessile zoogonidangium, which may be termina
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . y the penultimate cell assuming thefunction of an apical cell and growing upwards through the base of the oldzoogonidangium, which it leaves behind as a sort of collar. The zoogonidangiaare mostly ellipsoid or ovoid, usually sessile, but sometimes stalked, and theyopen by a terminal or subterminal pore. Brand (10) states that there are three types of zoogonidangia differentiated as follows :(1) the sessile zoogonidangium, which may be terminal, lateral or intercalary, and iswithout any marked annular thickenings on its dividing-wall ; it arises from a vegetativecell, is never detached from the filament which bears it, and discharges its zoogonidiain situ; (2) the stalked zoogonidangium, which is cut off from the end of an outgrowthfrom a vegetative cell and is therefore either terminal or lateral. It has concentric ringsof thickening on its dividing-wall, and these ultimately become a mechanism for itscomplete detachment, which takes place before the zoogonidia escape ; (3) the funnel.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni
