Myxophyceae 7 



times kidney-shaped associated in colonies of two, three or four; colonies 

 solitary or in small groups; sheaths very thick, straw-colored or dark-col- 

 ored, strongly lamellose, (lamellae 5-10), finally irregularly peeling off; 

 cells S.8-11 mic. in diameter; cell wall somewhat thick; cell contents gran- 

 ular, blue-green. 



West Indies. On damp wall of dam. Sharp's River. St. Vincent. (El- 

 liott). 



6. Chroococcus minutus (Kuetzing) Naegeli. Gatt. Einz. Alg. 46. 1849. De 



Toni. Syll. Algar. 5:14. 1907. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 20. no. 951. 1902. 



Plants 6-9 mic. in diameter, 10-13 tnic. in length, spherical or oblong, 

 more or less angular, usually united in twos; sheaths somewhat orbicular, 

 hyaline, distinct; cells 5-7 mic. in diameter, 9-10 mic. long; cell contents 

 homogeneous or granular, pale blue-green. 



Maine. Growing in high pool. Cape Rosier. July 1898. (Collins). 



7. Chroococcus multicoloratus Wood. Fresh-Water Algae North America. 



II. pi. s. f. 6. 1872. De Toni. Syll. Algar. 5:11. 1907. 



Plate I. fig. S. 



In a rriucous mass with other algae; plants 3 mic. in diameter, spherical 

 and single, or angular, semi-spherical or irregular and associated in oblong 

 families of from two to four (rarely eight) ; sheaths thick, hyaline, not lamel- 

 lose; cells 1.7 mic. in diameter; cell contents mostly homogeneous, some- 

 times minutely granular, yellowish-green, bluish-green, yellowish, brownish, 

 blackish, sometimes tinged with bright lake. 



Pennsylvania. On wet rocks. Near Philadelphia. (Wood). 



8. Chroococcus thermophilus Wood. Am. Journ. Sci. Arts. 122. 1869; 



Contr. Hist. Fresh-Water Algae North America. 12. 1872. De Toni. 

 Syll. Algar. 5: 10. 1907. 



WoUe. Fresh- Water Algae U. S. 335. 1887. 



Plants subglobose or oblong, angular, single or in twos or fours, associ- 

 ated in families; sheaths very thick, transparent, not lamellose, homogene- 

 ous; cells i-i.S mic. in diameter; cell contents sometimes minutely granular, 

 sometimes homogeneous, greenish. 



California. In Nostoc colonies. In hot springs (ioo°-i20°F.) Benton's 

 Spring. Owen's Valley, sixty miles southwest from the town of Aurora. 

 (Partz). 



9. Chroococcus varius A. Braun in Rabenhorst. Die Algen Europas. 



no. 246, 248, 2456. 1861-78. De Toni. Syll. Algar. 5:21. 1907. 



Tilden. American Algae. Century II. no. 198. 1896; Observations on 

 some West American Thermal Algae. Bot. Gaz. 25: 104. pi. 8. f. 21. 1898; Am. 

 Alg. Cent. VI. no. 600. 1902. Collins, Holden and Setchell. Phyc. Bor.- 

 Am. Fasc. 25. no. 1202. 1905. 



Plant mass gelatinous-mucous, dull brown or olive green; plants 4-8 mic. 

 in diameter, globose, single or in twos or fours, rarely forming larger fam- 



