22 Minnesota Algae 



WoUe. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: i37- i877. 

 (G. itzigsohnii Bornet). 



Plant mass brownish-red; families 15-60 mic. in diameter; sheaths con- 

 spicuously lamellose, the inner layers coppery-red, the outer ones paler or 

 colorless; cells 4-5 mic. in diameter, globose or ellipsoid; cell contents 

 greenish. 



Pennsylvania. Shaded rocks. (Wolle). 



47. Gloeocapsa janthina Naegeli. Gatt. Einz. Alg. 51. pi. i F. f. 5. 1849. 



De Toni. Syll. Algar. 5:40. 1907. 



Wolle. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: 137. 1877. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 25. no. 1205. 1905. 



Plant mass crustaceous, black; plants 7.5-12 mic. in diameter, spherical; 

 sheaths violet or reddish-violet, outer layers paler, sometimes peeling off; 

 cells 2-4.5 mic. in diameter; cell contents pale blue-green. 



Greenland. (Boergesen). Massachusetts. On dripping masonry under 

 railroad bridge. Melrose. August 1902. (Collins). New York. Cliffs. 

 Niagara. (Wolle). 



48. Gloeocapsa ralfsiana (Harvey) Kuetzing. Tab. Phyc. i: pi. 23. 1845- 



1849. De Toni. Syll. Algar. 5: 37. 1907. 



Plate I. fig. 30. 



Plant mass gelatinous, compact, dull dusky purple; plants 10-17 rnic. 

 in diameter, associated in families of from 2-8 cells; sheaths very thick, 

 opaque, intensely purple, the outer layers very wide, nearly colorless, usual- 

 ly angular from pressure, sometimes diffluent; cell contents granular, pale 

 blue-green. 



Greenland. In Parmelia saxatilus. (WuUschlaegel). 



49. Gloeocapsa thermalis Lemmermann. Algenfl. Sandwich-Inselji. Bot. 



Jahrb. 34: 614. pi. 7. f. 12-18. 1905. De Toni. Syll. Algar. 5: 36. 1907. 



Plate I. fig. 31. 



Plant mass mucous, hyaline or dark-purple; families 2-8 celled, usually 

 oblong, 8-1 1 mic. in length; plants, including sheath, 6-7.8 mic. in diameter, 

 globose, often solitary; sheaths hyaline or dark purple, granular; cells 1-2.6 

 mic. in diameter, globose, pale blue-green. 



Hawaii. In hot water. Volcano of Mauna Kea. Island of Hawaii. 

 1896-97. (Schauinsland). 



50. Gloeocapsa ambigua Naegeli in Kuetz. Spec. Algar. 220. 1849. De Toni. 



Syll. Algar. 5: 41. 1907. 



Setchell and Gardner. Algae of Northwestern America. Univ. Calif. 

 Pub. Bot. i: 179. 1903. (G. ambigua f. fuscolutea Naeg.) 



Plant mass crustaceous, violet becoming black; families about 62 mic. 

 in diameter; plants 4-8 mic. in diameter, spherical; sheaths violet, usually 

 opaque not lamellose; cells 1.8-2.5 mic. in diameter; cell contents finely 

 granular, blue-green. 



