. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . cum the aggregation of individuals may be so dense asto form a stratum. The outward form of the individual varies much, rangingfrom the globose cells of Halosphwra to the elongated stalked cells ofCharacium. In some of the endophytic forms, as in Phyllobium, long tubularoutgrowths permeate the tissues of the host. Dicranochfete is unique in thepossession of dichotomously branched bristles. From 4 to 128 zoogonidia arise in a mother-cell, and
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . cum the aggregation of individuals may be so dense asto form a stratum. The outward form of the individual varies much, rangingfrom the globose cells of Halosphwra to the elongated stalked cells ofCharacium. In some of the endophytic forms, as in Phyllobium, long tubularoutgrowths permeate the tissues of the host. Dicranochfete is unique in thepossession of dichotomously branched bristles. From 4 to 128 zoogonidia arise in a mother-cell, and are liberated eitherby the dissolution of the wall at some unlocalised point or by the separationof a distinct lid. In some of the Chlorochytrieae isogametes occur, and thezygote germinates without any period of rest. W. A. 14 210 ChlorococeinesR Sub-family As here constituted this group includesthe genus Chlorococcwm and those Algse which have been placed for sometime past in the Enclosphseraceae. All of them are characterized bythe rounded or ellipsoidal nature of their cells or coenocytes, which are for themost part Fig. 137. A, Chlorochytrium Lemiise Cohn ; a, part of leaf of Lemna trisulca, with threeChlorochytrium-cells; a young cell showing pyrenoids, a fully-developed one, and an emptyone ; b, gamete; c, zygozoospore ; a, x 360 ; b and c, x 720. B, Chlorochytrium biennc(Klebs) G. S. West; a, a large winter resting-cell which has divided into many cells; b, oneof the cells; c, formation of gametes in this cell; d, gamete ; e, zygozoospore ; a—d, x 800 ;e, x 720. (7, Phyllobium dimorphum Klebs ; a, empty resting-cell; b, microgamete; c, mega-gamete ; d, fusion of anisogametes; e, zygozoospore; /, germination of zygozoospore;</, young Phyllobiurn-cell; a, x72; b—g, x 720. D, Chlorochytrium Cohnii (Wright) G. ; a, vegetative cell; b, gamete ? ; c and d, development of motile cells; all x , Chlorochytrium paradoxum (Klebs
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