. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . nlike anything in the Ulotrichacese. Hazenremarks that all the dissepiments in the upper part of the thallus appeared to besoftened or broken down, and the masses of zoospores escaped through the open funnelformed by the outer cell-wall. Family Microsporacese. 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 freshwaterAlgse. The f
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . nlike anything in the Ulotrichacese. Hazenremarks that all the dissepiments in the upper part of the thallus appeared to besoftened or broken down, and the masses of zoospores escaped through the open funnelformed by the outer cell-wall. Family Microsporacese. 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 freshwaterAlgse. 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. irregidarisW. & G. S. West (06). The lamellaconsist 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 certain. Fig. 184. A, Microspora amcena (Kiitz.) and C, ? M. abbreriatu (liabenh.) Lagerh.; B, vegetative filament; C, filament with species of the genus. This occursaplanospores (a). D, M. pachyderma (Wille)Lagerh. E, single vegetative cell of M. amcenavar. crassior Hansg., showing the reticulatedchloroplast. The indistinct blur in the centreof the cell indicates ~the position of the , fragment of filament of M. amcena withaplanospore (a). All x 520. in M. tumidula, in the typical formsof M. amcena and M. Lofgrenii, andto some extent in M. floccosa andM. quadrata. In the two last- mentioned species the disarticula-tiori 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 communica
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