Myxophyceae 201 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 7. no. 309. 1897. 

 Setchell. Notes on Cyanophyceae. III. Erythea. 7: 52. 1899. Tilden. 



American Algae. Cent. VI. no. 575. 1902. Setchell and Gardner. Algae of 

 Northwestern America. Univ. Calif. Pub. Bot. i: 193. 1903. 



Plant mass mucous, orbicular-confluent, finally becoming widely ex- 

 panded, very deep blackish green; trichomes 4.2 mic. in diameter, slightly 

 constricted at joints; cells 4-5 mic. in length; heterocysts 5-6 mic. in diame- 

 ter, 7-12 mic. in length, oblong; gonidia 12-14 ^c. in diameter, 20-38 mic. 

 in length, oblong or ventricose-elliptical, with truncate apices; wall of go- 

 nidium smooth, brownish or reddish; cell contents pale blue-green. 



New York. Ithaca. (Atkinson). Minnesota. On stones at edge of 

 river, near quarry. St. Louis River, Fond du Lac, near Duluth. August 1901. 

 (Tilden). Washington. On mud or moist sand. Near Oak Harbor, Whid- 

 bey Island; near Mt. Vernon, Skagit County; near Seattle. (Gardner). 

 California. Growing upon a bank within reach of salt spray. Bolinas, Marin 

 County. (Setchell). 



371. Cylindrospermum catenatum Ralfs. On the Nostochineae. Ann. and 

 Mag. of Nat. Hist. S: 338. 1850. Bornet and Flahault. Revis. des 

 Nostoc. Ann. Sci. Nat. Bot. VII. 7: 254- 1888. D^ Toni. Syll. Algar. 

 S: 477. 1907. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 11. no. 505. 1898. 

 Collins. Notes on Algae. — I. Rhodora. i : 9. 1899. Tilden. American Al- 

 gae. Cent. IV. no. 395. 1900. Setchell and Gardner. Algae of Northwest- 

 ern America. Univ. Calif. Pub. Bot. i: 193. 1903. 



Plate X. fig. 7. 



Plant mass mucous, orbicular-confluent, indefinite, blackish green; trich- 

 omes 4 mic. in diameter, constricted at joints; cells 4-5 mic. in length; 

 heterocysts 4 mic. in diameter, 6-7 mic. in length, oblong; gonidia 7-10 mic. 

 in diameter, 13-18 mic. in length, oblong, two to eight in series; wall of go- 

 r.idium smooth, orange brown. 



Massachusetts. Forming a dark thin coating on the ground, looking 

 as if a little black paint had been spilled and dried. On moist earth near 

 S-^ot Pond. Middlesex Fells. August and September 1897. (Collins). Wash- 

 ington. Floating in stagnant place in stream. Tracyton, Kitsap County. July 

 1898. (Tilden). Hawaii. At edge of mountain stream. Kaliuwaa Stream, 

 Makao, Koolauloa, Oahu. June 1900. (Tilden). 



Genus RICHELIA Johs. Schm. 

 Vid. Medd. Nat. Foren Kjob. 147. 1901. 



Sheaths not present; trjchomes single, endophytic; heterocysts solitary, 

 situated at the base of the trichome. 



X72. Richelia intracellularis J. Schm. Plankton fra det Rode Hav og 

 Adenbugten. Vid. Medd. fra. d. Nat. Foren. Kjob. 147. 1901. De 

 Toni. Syll. Algar. 5: 480. 1907. 



