. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . in some cases to discriminate between micro- and the zoogonidium of Cephaleuros hascome to rest its protoplast frequently un-dergoes a rejuvenescence and is then setfree by the rupture of the enclosing mem-brane as a gonidium which can at oncegerminate (Mann & Hutchinson, 07). Isogametes are known to occur in anumber of different forms. In Cephalearosand Phycopeltis they arise from disc-cells,but in Trentepohlia the gamet
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . in some cases to discriminate between micro- and the zoogonidium of Cephaleuros hascome to rest its protoplast frequently un-dergoes a rejuvenescence and is then setfree by the rupture of the enclosing mem-brane as a gonidium which can at oncegerminate (Mann & Hutchinson, 07). Isogametes are known to occur in anumber of different forms. In Cephalearosand Phycopeltis they arise from disc-cells,but in Trentepohlia the gametangia arefound in terminal or intercalary positionson the erect branches, either solitary or ingroups; they are very similar to the zoogo-nidangia, with which it is probable theyare often confused. The gametes arebiciliated, ovoid and complanate, withouta pigment-spot (fig. 92 B). They are setfree from the gametangia in large num-bers and their fusion has been observedin Trentepohlia and Phycopeltis. Thegermination of the zygote is not fullyknown, but is probably direct. Gameteshave occasionally been observed to ger-minate
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