. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 8 The Fresh Water Algae of 2. Cells endophytic in free-floating eolorless alga, 2-8 individnals within common wall of host. â . ^ Glaucocystis (p. 15). ±5. Cells forming a flat thaJlus or very short filament with basal-apicaJ differentiation; endospore formation usually evident; plant always attached (Chamaesiphonales) : 1. Plant body a multicellular thallus, mostly 1 cell thick, formed by vegetative cell division; cells rounded or angular by mutual compression Xenococcus (p. 15). 2. Cells usuaUy gregarious but not in col
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 8 The Fresh Water Algae of 2. Cells endophytic in free-floating eolorless alga, 2-8 individnals within common wall of host. â . ^ Glaucocystis (p. 15). ±5. Cells forming a flat thaJlus or very short filament with basal-apicaJ differentiation; endospore formation usually evident; plant always attached (Chamaesiphonales) : 1. Plant body a multicellular thallus, mostly 1 cell thick, formed by vegetative cell division; cells rounded or angular by mutual compression Xenococcus (p. 15). 2. Cells usuaUy gregarious but not in colonies, no vegetative cell division; cells ovoid, pyriform or cylindrical; endospores formed in basipetalous succession TT ^ ,, . , Chamaesiphon (p. 15). II. Cells united in definite filaments (Hoemogonales) : A. Trichomes (except for terminal cells) of same diameter throughout; no heterocysts or akinetes: 1. Trichomes without a sheath: a. Trichomes straight or in irregular spirals OsciUatoria (p. 15). b. Trichomes in regular spirals: 1'. Dissepients distinct ^ ^ Arthrospira (p. 18). 2\ Dissepients lacking ^ SpiruUna (p. 18). 2. Trichomes with a sheath: a. One trichome within a sheath: l^ Sheaths laterally confluent with one another: a'. Plant mass with erect tufts Symploca (p. 19). b'. Plant mass expanded in a woolly or felt-like layer Phormidium (p. 19). 2\ Sheaths not confluent with one another, firm. â Lynghya (p. 20). D. Many trichomes in a common sheath: 1^ Sheaths extremely gelatinous, homogeneous Microcoleus (p. 21). 2'. Sheaths firm, usually lamellated Schizothrix (p. 21). B. Trichomes of uniform thickness or attenuated to a hair-like point- heterocysts regularly present; akinetes frequent: ' 1. Trichomes not attenuated from base to apex: a. Filaments unbranched; trichomes simple, uniseriate: 1'. Heterocysts intercalary: a^ Cells spherical or longer than broad: â¢Â«t > >>jr7 <»F â » ^y» *>r > >f h. *V ^^v' > 4 Woods Hole, Massac
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