198 Minnesota Algae 



C Gonidia 12-14 niic. in diameter, 20-38 mic. in length 



C. licheniforme 



II Gonidia seriate C. catenatum 



364. Cylindrospermum stagnale (Kuetzing) Bornet and Flahault. Revis. des 

 Nostoc. Ann. Sci. Nat. Bot. VII. 7: 250. 1888. De Toni. Syll. Al- 

 gar. 5: 472. 1907. 



Wood. Contr. Hist. Fresh-Water Algae North America. 40. pi. 2. f. 7. 

 •1872. (C. macrospermum Kg., Anabaena stagnalis Kg.) 

 WoUe. Fresh-Water Algae U. S. 292. pi. 199. f. 6-8. 1887. Wolle and 

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

 Geol. Surv. N. J. 2: 607. 1889. Anderson and Kelsey. Common and Con- 

 spicuous Algae of Montana. Bull. Torr. Bot. Club. 18: 145. 1891. Tilden. 

 List of fresh-water Algae collected in Minnesota during 1893. Minn. Bot. 

 Studies. 1:31. 1894. (Cylindrospermum limnicola Kuetz.) Col- 

 lins. Notes on Algae. — IV. Rhodora. 3: 289. 1901. Collins, Holden and 

 Setchell. Phyc. Bor.-Am. Fasc. 18. no. 856. 1901. Tilden. American Algae. 

 Cent. V. no. 481. 1901; Collection of Algae from the Hawaiian Islands. 

 Hawaiian Almanac and Annual for 1902. 112. 1901; Algae collecting in the 

 Hawaiian Islands. Postelsia: The Year Book of the Minnesota Seaside Sta- 

 tion, i: 168. 1902. Kellerman. Proposed Algological Survey of Ohio. 

 Ohio Nat. 2: 222. 1902. Clark. The Holophytic Plankton of Lakes Atit- 

 lan and Amatitlan, Guatemala. Proc. Biol. Soc. Wash. 21: 97. 1908. Bu- 

 chanan. Notes on the Algae of Iowa. Proc. Iowa Acad. Sci. 14: 12. 1908. 



Plate X. fig. 2. 



Plant mass floccose, expanded, attached or floating; trichomes 3.8-4.5 

 mic. in diameter, slightly constricted at joints; cells up to three or four 

 .times longer than their diameter; heterocysts 6-7 mic. in diameter, up to 

 16 mic. in length, somewhat spherical, often oblong; gonidia 10-16 mic. 

 in diameter, 32-40 mic. in length, cylindrical, with rotund apices; wall of 

 gonidium smooth, yellowish brown; cell contents pale blue-green. 



Maine. Forming a dense bluish green or brownish scum on the surface 

 of an artificial pond at the Pogy Oil Factory, Bristol, near Round Pond 

 Village. July 1901. (Collins). New Jersey. Frequent in wet places on 

 dead wood. (Wolle). South Carolina. "In bottom of shallow, slowly 

 running streams, adhering to ground or fallen leaves, etc., gelatinous, green." 

 Near Aiken. September. (Ravenel). Ohio. (Kellerman). Minnesota. 

 Irving Chase Lake. July 1893. (Tilden). Iowa. Iowa City. (Hobby). 

 Montana. Ponds and semi-stagnant, mud-bottomed parts of streams in the 

 mountains and on the plains. Common throughout. June to November. 

 (Anderson and Kelsey). Central America. On surface of water. Lake 

 Amatitlan, Guatemala. February 1906. (Meek). Hawaii. On wet cliffs. 



Laupahoehoe, Hawaii. July 1900. (Tilden). 



36s. Cylindrospermum comatum Wood. Contr. Hist. Fresh-Water Algae 

 North America. 41. pi. 2. f. 1872. Wolle. Fresh-Water Algae U. S. 

 293. pi. 199. f. 16. 1887. 



