. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . anch - segmentsform a facetted cortex. Spherical aplanosporangia occur in a terminalposition on the basal branch-segments,and each produces a single aplano-spore. Bornetella (fig. 173) mainlydiffers from Neomeris in its poly-tomous branching, and its laterallydeveloped aplanosporangia whichproduce a number of globular aplano-spores (fig. 173 1 sp. and 3). In Cymopolia the habit is main axial coenocyte is repeatedlybranched in a
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . anch - segmentsform a facetted cortex. Spherical aplanosporangia occur in a terminalposition on the basal branch-segments,and each produces a single aplano-spore. Bornetella (fig. 173) mainlydiffers from Neomeris in its poly-tomous branching, and its laterallydeveloped aplanosporangia whichproduce a number of globular aplano-spores (fig. 173 1 sp. and 3). In Cymopolia the habit is main axial coenocyte is repeatedlybranched in a dichotomous manner,the branch-segments being all in oneplane. Each branch-segment is calci-fied except at the constricted branches of the main axis bearclosely set whorls of polytomousbranches, the terminal segments ofwhich are hair-like and the calcified parts of the thallusthe cortex consists of the swollenbranch-segments of the second order,but only the basal branch-segmentspersist at the uncalcified constrictionsof the thallus. The aplanosporangia are similar to those of Neomeris andare developed terminally on the basal. Fig. 173. 1 and 3, Bornetella oligosporaSolms. 1, entire plant, slightly magnified,showing partly the external and partly theinternal structure; a, axis; zw, branches ofthe first order; /, peripheral facets; kr,calcareous zone of same; sp, aplanosporan-gia. 3, single aplanosporangium. 2,three peripheral facets of B. nitida (Harv.) (1 and 3, after Solms; #,after C. Cramer; from Oltmanns.) branch-segments of the calcified parts of the thallus. Acetabulariese 271
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