. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 185. A, ? Microspora abbreviata (Rabenh.) Lagerh., three cells to show the chloroplast,x 1000. B, two cells of M. tiimidula Hazen, showing form of chloroplast, x 1000. C andD, portions of two filaments of M. stagnorum (Kiitz.) Lagerh. showing characteristicvariations in the chloroplast, x 500. E, escape of zoogonidia in M. tumidula Hazen, inwhich the cell-walls break up into H-pieces, x 500. F, escape of zoogonidia in M. floccosa(Vauch.)
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 185. A, ? Microspora abbreviata (Rabenh.) Lagerh., three cells to show the chloroplast,x 1000. B, two cells of M. tiimidula Hazen, showing form of chloroplast, x 1000. C andD, portions of two filaments of M. stagnorum (Kiitz.) Lagerh. showing characteristicvariations in the chloroplast, x 500. E, escape of zoogonidia in M. tumidula Hazen, inwhich the cell-walls break up into H-pieces, x 500. F, escape of zoogonidia in M. floccosa(Vauch.) Thur., in which the H-pieces are more irregular and there is slight gelatinizationof the wall, x 500. G, escape of zoogonidia of M. stagnorum, in which H-pieces are neverformed but the wall is completely converted into mucilage, x 500. H—J, germination ofzoogouidium of M. stagnorum, x 500. (consult fig. 185 D), is one of the leading characters of the genus. Thecushions of the chloroplast are usually spread over both lateral and terminalwalls, and in some instances (frequently in M. stagnorum and occasionally inM. floccosa) they are disposed as
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