54 SPECIES OF ALGiE. 



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54. TETRASPORA. /3^/^/' /'//• ,S ///(•• 



§ Thallus tubular, splitting (a). 



§ Thallus irregularly expanded (U). 



§ Thallus membranous, saccate, obovate, sinuate, buUose (c). 



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



cylindrica, 1 90 



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



i. Colorless, or green edged gelati?wsa, 191 



J>. Green, rather soft and slippery explanata, 191 



£. Dark green, smooth or somewhat warty; cells crowed in 2s or 4s, 



bullosa, 190 



55. SCHIZOCHLAMYS. 



Supposed to be a form of Tetraspora. 



56. PALMELLA. 



§ Aquatic {a). 



§ On wet ground or dripping rocks (V). 



§ On wet wood . uvcsformis, 193, botryoides, 194 



a. Irregularly expanded; cells minute (o. 75-1. 00/t), crowded, 



hyalina, 193 



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



Mooreana, 193 



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



57. PORPHRYDIUM. 



One species; terrestrial cruentutn, 194 



58. BOTRYDINA. 



One species; terrestrial . vulgaris, 195 



59. BOTRYCOCCTJS 



One species; aquatic Braunii, 195 



60. GLOeOCYSTIS. 



§ Aquatic (a). 



§ On wet rocks and walls; cells 3-S;U in diameter . . rnpestris, 196 



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

 a. " " " " families about 35// in diameter, 



vesiculosa, 196 



a. Brownish-yellow or reddish rufescens, 196 



61. NEPHROCYTIUM. 



Families oblong or elliptical, cells reniform . . Agardhianum, ig"] 

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



