6 Minnesota Algae 



ophyceae. III. Erythea 7:54. 1899. Collins, Holden and Setchell. Phyc. 

 Bor.-Am. Fasc. 16. no. 751. 1900. Collins. Preliminary Lists of New Eng- 

 land Plants.— V. Marine Algae. Rhodora 2:41. 1900; The Algae of Jamaica. 

 Proc. Am. Acad. Arts Sci. 37: 239. 1901. Saunders. The Algae. Harriman 

 Alaska Expedition. Proc. Wash. Acad. Sci. 3:396. 1901. Setchell and Gard- 

 ner. Algae of Northwestern America. Univ. Calif. Pub. Bot. 1 : 179. 1903- 

 Riddle. Brush Lake Algae. Ohio Nat. 5:268. 1905. Lemmermann. Al- 

 genfl. Sandwich-Inseln. Bot. .Tahrb. 34: 614. 1905. 



Plate L fig. 3. 



Plants spherical, oblong-ellipsoid or more or less angular from com- 

 pression, single or associated in families of two, four, rarely eight; sheaths 

 thick, usually lamellose, hyaline; cells 13-25, rarely 40 mic. in diameter; 

 ctll wall thin; cell contents homogeneous, pale blue-green, later becoming 

 brownish and granular. 



Arctic regions. Among Nostoc. Shores of Discovery Bay. (Dickie). 

 Alaska. Distributed through a mass of Microcystis marginata 

 which formed a slimy coating on a perpendicular clifi over which water was 

 trickling. Juneau. (Saunders). Among other algae in pools of fresh water 

 or on dripping rocks. Glacier Valley. Unalaska. (Lawson). Canada. High 

 Park. Toronto, Ontario. (Mackenzie). Maine. Common among various al- 

 gae in lagoon. Little Cranberry Isle. (Collins). Massachusetts. On 

 slimy rocks and piers. Cape Ann. (Davis). On woodwork near high water 

 mark. Everett. Medford. (Collins). On woodwork. County of Nantucket. 

 (Collins). Connecticut. (Collins). Rhode Island. Common. (Bennett). 

 New York. Pier. Stapleton, Staten Island; on rocks in brook near Silver 

 Lake, spring and summer. (Pike). New Jersey. Terrestrial. On moist 

 rocks. Frequent. (Wolle). Ohio. Brush Lake. Champaign County. Fall 

 of 1902. . (Riddle). Washington. In brackish water. Whidbey Island. 

 (Gardner). California. On slimy rocks and cliflfs at high water. (Ander- 

 son). In fresh, brackish and even in somewhat alkaline waters. (Setchell). 

 West Indies. Among various algae. Jamaica. July 1900. (Pease and Butler). 

 Hawaii. In stagnant water. Mauna Kea. Island of Hawaii. (Berggren). 



Var. fuscescens (Kuetz.) De Toni. Richter. Siisswasseralgen aus deni 

 Umanakdistrikt. Bib. Bot. Heft. 42. 3. 1897. De Toni. Syll. Algar. 5: 13. 

 1907. 



Cell contents becoming dark-colored. 

 Greenland. Umanak. (Vanhoffen). 



5. Chroococcus schizodermaticus West. Algae of English Lake District. 

 Journ. Roy. Mic. Soc. 742. pi. 10. f. 61, 63. 1892. De Toni. Syll. Algar. 

 5:13. 1907- 



West and West. On some Freshwater Algae from the West Indies. 

 Journ. Linn. Soc. Bot. 30: 275. pi. 16. f. 19. 1895. 



Plate I. fig. 4. 



Plants 21-42 mic. in diameter, somewhat globose or triangular, some- 



