54 SPECIES^ OF ALG^E. 



54. TETRASPORA. 



Thallus tubular, splitting (a). 



Thallus irregularly expanded (b). 



Thallus membranous, saccate, obovate, sinuate, bullose (c). 



a. Cells about i6/t in diam.; ends tapering to a fine point, 



tylindrica, 1 90 



a. Cells 8-io/f in diam. ; yellowish-green lubrica, 191 



b. Colorless, or green edged gelatinosa, 191 



b. Green, rather soft and slippery explanata, 191 



. Dark green, smooth or somewhat warty; cells crowed in 25 or 45, 



bullosa, 1 90 



55. SCHIZOCHLAMYS. 



Supposed to be a form of Tetraspora. 



56. PALMELLA. 



Aquatic (a). 



On wet ground or dripping rocks (b). 



On wet wood uv&formis, 193, botryoides, 194 



a. Irregularly expanded; cells minute (0.75-1. oo/*), crowded, 



hyalina, 193 



a. Somewhat globose, tuberculate; cells elliptical, 5 by 8/1, 



Mooreana, 1 93 



b. Thallus expanded or indefinite . . . mucosa, 192, miniata, 193 



57. PORPHRYDIUM. 



One species; terrestrial cruentum, 194 



58. BOTRYDINA. 



One species; terrestrial vulgar is, 195 



59. BOTRYCOCCUS 



One species; aquatic Braunii, 195 



60. GLceocvsTis. 

 Aquatic (a). 



On wet rocks and walls; cells 3-5 /* in diameter . . rnpestris, 196 

 a. Dirty or bright green; families 45-90;^ in diameter . ampla, 196 

 a. " " " " families about 35;* in diameter, 



vesiculosa, 1 96 

 a. Brownish-yellow or reddish rufescens, 196 



6l. NEPHROCYTIUM. 



Families oblong or elliptical, cells reniform . . Agardhianum, 197 

 Families subspherical, cells oblong or elliptical . . Ncegelii, 197 



