Myxophyceae 19 



hyaline, colorless, somewhat homogeneous; cell contents flesh-colored to 

 honey-colored. 



Colorado. On walls and bare earth, often mixed with other algae. 

 (WoUe). 



39. Gloeocapsa atrata (Turpin) Kuetzing. Tab. Phyc. i: pi. 21. f. 4. 1845- 



1849. De Toni. Syll. Algar. 5: 57. 1907. 



Plate I. fig. 22. 



Plant mass crustaceous, mucous, black; plants 9-14 mic. in diameter, 

 spherical; sheaths very tliick, hyaline, or pale blue, homogeneous, two or 

 three times as wide as lumen of cell; cells 3.5-4.5 mic. in diameter; cell con- 

 tents somewhat granular, pale blue-green. 



Alaska. (Setchell). 



40. Gloeocapsa muralis Kuetzing. Tab. Phyc. i: pi. 21. f. i. 1845-1849. De 



Toni. Syll. Algar. 5: 52. 1907. 



Plate I. fig. 23. 



Plant mass more or less expanded, delicate, gelatinous, dull olive to 

 brownish-green; plants 13-26 mic. in diameter, usually ellipsoid or oblong; 

 sheaths spherical or elliptical, hyaline, colorless or yellowish, usually indis- 

 tinctly lamellose; cells 5-8 mic. in diameter; cell contents somewhat granu- 

 lose, blue-green. 



West Indies. St. Vincent. (West). 



41. Gloeocapsa rupestris Kuetzing. Tab. Phyc. i: 17. pi. 22. f. 2. 1845-1849. 



De Toni. Syll. Algar. 5:46. 1907. 

 Tilden. American Algae. Cent. VI. no. 599. 1902. 

 Plate I. fig. 24. 



Plant mass grayish-brown to black, crustaceous, somewhat hard; plants 

 spherical, associated in families 15-7S mic. wide; sheaths very thick, lam- 

 ellose, yellowish or orange becoming darker; cells 6-9 mic. in diameter; 

 cell contents granular, blue-green. 



Greenland. (Boergesen). New Jersey. (Wolle). Minnesota. On 

 moist wall growing on lime encrusted moss and on disintegrated limestone. 

 In stene quarry. Near campus. University of Minnesota, Minneapolis. 

 November 1901. (Lilley). 



42. Gloeocapsa fusco-lutea (Naegeli) Kuetzing. Spec. Algar. 224. 1849. De 



Toni. Syll. Algar. 5: 47. 1907. 



Plant mass crustaceous, becoming black; families 50 mic. in diameter, 

 spherical or oval; plants 4.5-5.5 mic. in diameter, globose; sheaths yellow or 

 yellowish-brown, usually not lamellose; cells 1.5-2 mic. in diameter; cell 

 contents blue-green becoming pale. 



North America. (Setchell). 



43. Gloeocapsa sparsa Wood. Contr. Hist. Fresh-Water Algae North 



America. 13. 1872. De Toni. Syll. Algar. 5:45. 1907. 



