. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . zoospores escaped through the open funnelformed by the outer cell-wall. Family Microsporaceae. This family includes only the one genus Microspora (Thuret, 1850; em. Lagerheim, 1888)1 the species ofwhich are amongst the most abundantand widely distributed of freshwaterAlgae. The filaments are cylindricaland unbranched, and from the veryearliest stages of development arefree-floating. The cell-wall varies incharacter in the different species of
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . zoospores escaped through the open funnelformed by the outer cell-wall. Family Microsporaceae. This family includes only the one genus Microspora (Thuret, 1850; em. Lagerheim, 1888)1 the species ofwhich are amongst the most abundantand widely distributed of freshwaterAlgae. The filaments are cylindricaland unbranched, and from the veryearliest stages of development arefree-floating. The cell-wall varies incharacter in the different species ofthe genus. In some it is apparentlyhomogeneous, but in others it isdistinctly lamellate, attaining itsgreatest thickness and irregularity inMicrospora amcena var. irregularisW. & G. S. West (06). The lamellaeconsist of cellulose. The statementso frequently made that the lamellaeof the wall are so laid down that thefilaments become disarticulated intoH-pieces is only true of certainspecies of the genus. This occursin M. tumidula, in the typical formsof M. amcena and M. Lofgrenii, andto some extent in M. floccosa andM. quadrata. In the two last-. Fig. 184. A, Microspora amcena (Kiitz.) aud C, ? M. abbreviata (Rabenh.) Lagerh.;B, vegetative filament; C, filament withaplanospores (a). D, M. pachyderma (Wille)Lagerh. E, single vegetative cell of M. amcenavar. crassior Hansg., showing the reticulatedcliloroplast. The indistinct blur in the centreof the cell indicates the position of the , fragment of filament of M. amcena withaplanospore (a). All x 520. mentioned species the disarticula-tion is only partial and often irregular, parts of the lateral walls usually 1 The main conclusions of the paper on The Structure, Life-History and SystematicPosition of the genus Microspora, which was communicated by the present author to theBritish Association at the Birmingham Meeting in September, 1913, are embodied in thisaccount of the Microsporacese. The recent paper by
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