. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . chromatophores, x960; C, zoogoni-dium, x960 (after Kuckuck). D—H,Physocytium confervicola Borzi, x 600(after Borzi). D, young colonies at-tached to a filament of Spirogyra ; E,formation of zoogonidia; F, zoogoni-dium ; G, gamete; H, germination ofzygote. Clilorangiex 185 In Tetraspora, if the conditions are unfavourable, during the formationof zoogonidia the cells become invested in a strong resistant cell-wall andbecome hypnospores (Gay, 91;

---

. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . chromatophores, x960; C, zoogoni-dium, x960 (after Kuckuck). D—H,Physocytium confervicola Borzi, x 600(after Borzi). D, young colonies at-tached to a filament of Spirogyra ; E,formation of zoogonidia; F, zoogoni-dium ; G, gamete; H, germination ofzygote. Clilorangiex 185 In Tetraspora, if the conditions are unfavourable, during the formationof zoogonidia the cells become invested in a strong resistant cell-wall andbecome hypnospores (Gay, 91; Chodat, 02). The pseudocilia, or motionless cilia, of the Tetrasporese are unique amongthe Protococcales. Sub-family This is a small group of attached Alga?, fixedin all cases to a substratum by means of mucilaginous stalks. Physocytiuiii,which is the simplest form, is unicellular; and the stalk of attachment isformed by the conversion into mucilage of the two cilia of the zoogonidium,after the latter has become quiescent with the tips of the cilia resting onthe wall of some larger filamentous Alga (fig. 110 D—H\ In Prasinodadns.

---

Size: 1674px × 1493px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni