Myxophyceae 29 



ish-green becoming brownish when dry; sheaths very thick, not lamellose, 

 colorless, soon diffluent; cells 5-6 mic. in diameter, spherical, scattered, 

 single or in pairs; cell contents finely granular, blue-green. 



Pennsylvania. In ponds attached to wood or stone. (WoUe). 



68. Aphanocapsa virescens (Hassall) Rabenhorst. Fl. Eur. Algar. 2: 48. 

 1865. De Toni. Syll. Algar. 5: 68. 1907. 



WoUe. Fresh-Water Algae U. S. 333- pl- 210. f. 33. 1887. WoUe 

 and Martindale. Algae. Britton's Catalogue of Plants found in New Jersey. 

 Geol. Surv. N. J. 2:612. 1889. West. The Freshwater Algae of Maine. 

 Journ. of Bot. 27:207. 1889. 



Plate II. fig. 10, II. 



Plant mass amorphous, gelatinous, more or less expanded, dirty green 

 or olive, becoming brownish; sheaths scarcely visible, diffluent; cells about 

 6 mic. in diameter, globose, single or in pairs; cell contents homogeneous, 

 often showing a central granule, pale blue-green. 



Maine. (West). New Jersey. On wet stones and rocks. (Wolle). 



69. Aphanocapsa brunnea Naegeli. Gatt. Einz. Alg. 52. 1849. De Toni. 

 Syll. Algar. 5:71. 1907. 



Wolle. Fresh-Water Algae U. S. 329. 1887. 



Plant mass gelatinous, membranaceous, expanded, brownish; sheaths 

 not visible; cells 4.5-5.5 mic. in diameter, spherical, in division oblong, 

 single or in pairs, crowded; cell contents finely granular, pale yellowish 

 brown or greenish brown. 



North America. Forming brownish-olive, floating masses in stagnant 

 waters. (Wolle). Canada. Minnesota Seaside Station, Vancouver Island. 

 British Columbia. July 1901. (Crosby and Leavitt). 



Genus APHANOTHECE Naeg. Gatt. Einz. Algar. 59. 1849- 



Plant mass more or less expanded, somewhat spherical or without def- 

 inite shape; individual sheaths thick, not distinct, confluent into a mucous, 

 amorphous, homogeneous colonial tegument; cells oblong; reproduction by 

 division of the cells in one direction only. 



I Plant mass without definite shape. 



1 Cells 1-2 mic. in diameter A. saxicola 



2 Cells more than 2 mic. in diameter 



(i) Plant mass dirty green or olive brown; cells 2.5-3 mic. in diameter 



A. conferta 



(2) Growing in very salt water; cells 5 mic. in diameter, hardly longer 



than broad A. utahensis 



(3) Cells one to three times as long as broad 



A Plant mass colorless; cells 4-4.5 mic. in diameter 



A. microscopica 



