initial cross wall of the branch slightly above the plane of origin. 

 Cells 3-4/x in diameter, 14-25/x long. 



On moss and other submerged aquatics and on large filamentous 

 algae. Mich., Wis. 



ENTOCLADIA Reinke 1879, p. 476 



Thallus composed of irregularly-branched filaments which are 

 spreading, or which form a thin cushion-like mass of ovoid or an- 

 gular cells under and through the membrane of cladophoraceous 

 cells. Chloroplast parietal, with a single pyrenoid. 



Entocladia polymorpha (G. S. West) G. M. Smith 1933, p. 400 



PL 14, Fig. 9 



Filaments highly branched and irregularly spreading, composed 

 of loosely arranged and irregularly shaped but more or less rectan- 

 gular cells 9-12-(20)/i. in diameter. Filamentous habit sometimes 

 obscured by superimposed cells. 



On Cladophora and Rhizoclonium. Wis. 



PROTODERMA Kuetzing 1843, p. 295 

 Thallus an attached, monostromatic or pseudoparenchymatous 

 disc of horizontally growing filaments, which are closely arranged 

 and semi-radiate. Filaments irregularly branching, but the branches 

 frequently indefinite and not clearly evident, becoming free and 

 apparent at the margin of the thallus. Walls thin and without setae. 

 Chloroplast a parietal disc with 1 pyrenoid. 



Care must be used to separate this plant from the young stages of 

 Stigeoclonium and other horizontally-growing members of the 

 Chaetophoraceae. 



Protoderma viride Kuetzing 1843, p. 295 

 PI. 9, Fig. 10; PI. 14, Fig. 10 

 Thallus an attached disc, irregular in outline, made up of branched 

 filaments which are compact and parenchymatous internally but 

 semi-radiate and spreading at the margin; terminal cells slightly 

 narrowed. Cells quadrate or cylindrical, with thin walls; 3-6/i, in 

 diameter, 10-15^t in length. 



Attached to Cladophora and other coarse filamentous algae. Wis. 



PSEUDULVELLA Wille 1911, p. 90 

 Thallus an attached pseudoparenchymatous, cushion-like disc, 

 several cells in thickness, inclosed by a mucilaginous envelope from 



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