264 Minnesota Algae 



August 1894. (Pease and Butler). On rocks, etc., littoral. Porto Rico. May 

 1903. (Howe). 



475. Calothrix Crustacea Thuret. Notes Algologiques. i: 13. pi. 4. 1878. 



Bornet and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 



3: 359. 1886. De Toni. Syll. Algar. 5: 613. 1907. 

 Maze and Schramm. Essai Class. Algues Guadeloupe. 31. 1870-1877. 

 Farlow, Anderson and Eaton. Algae Am. Bor. Exsicc. no. 49. 1877. Far- 

 low. Marine Algae of New England. 36. 1881. Pike. Check List of Marine 

 Algae. Bull. Torr. Bot. Club. 13: 105. 1886. Collins. Algae from Atlantic 

 City, N. J. Bull. Torr. Bot. Club. 15: 310. 1888; Algae of Middlesex County. 

 13. 1888; Marine Algae of Nantucket. 5. 1888. Bennett. Plants of Rhode 

 Island. 95. 1888. Martindale. Marine Algae of the New Jersey coast and 

 Adjacent Waters of Staten Island. Mem. Torr. Bot. Club, i: 91. 1889. 

 WoUe and Martindale. Algae. Britton's Catalogue of Plants found in New 

 Jersey. Geol. Surv. N. J. 2: 602. 1889. Murray. Catalogue of the Marine 

 Algae of the West Indian Region. Journ. of Bot. 27: 261. 1889.(5 ch i z o- 

 siphon pilosus Crn.). Anderson. List of California Marine Algae, 

 with Notes. Zoe. 2: 218. 1891. Collins, Holden and Setchell. Phyc. Bor.- 

 Am. Fasc. i. no. 10. 1895. Collins. Preliminary Lists of New England 

 Plants.- — V. Marine Algae. Rhodora. 2: 41. 1900. Setchell and Gardner. 

 Algae of Northwestern America. Univ. Calif. Pub. Bot. i: 197. 1903. Col- 

 lins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 25. no. 1212. 1905. Col- 

 lins. Phycological Notes of the late Isaac Holden. — 11. Rhodora. 7: 223. 

 1905. 



Plate XVII. fig. 2-6. 



Plant mass caespitose, velvety, widely expanded, blackish green or 

 brownish; filaments 12-40 mic. in diameter, 1-2 mm. in length, erect, densely 

 crowded, a little thickened at the base; sheaths somewhat thick, colorless 

 or yellowish brown, in the older filaments lamellose, variously dilated and 

 expanded in upper portions; trichomes 8-15 mic. in diameter, ending in a 

 long hair; cells short; heterocysts one to three at the base, often many 

 scattered through the trichome; hormogones many within the sheath, four 

 01 five times longer than wide; gonidia oblong, cylindrical, smooth, in 

 series. 



Canada; On other algae. Malpeque, Prince Edward Island. (FauU). 

 Maine. (Collins). New Hampshire. (Collins). Massachusetts. On 



Ulva in salt water. Medford; Everett; Brant Point and Polpis. (Collins). 

 On algae of all kinds and on rocks. Wood's Holl. (Farlow). Rhode 



Island. Narragansett Bay. (Bennett). (Collins). Connecticut. Clothing 

 fronds of Cladophora, Enteromorpha and other algae, also on 

 rocks. Woodmont. July 1892; on algae and rocks, Stratford Shoals; Cook's 

 Point, July, September, October. (Holden). New York. Shores of Long 

 Island: Bay Ridge, Fort Hamilton. Summer. (Pike). New Jersey. On 

 rockweed. Atlantic Ocean. (MorSc, Martindale). Florida. (Harvey, Mel- 

 ville). Washington. Floating, on rocks, clay banks, wood, etc., in brack- 

 ish lagoon. Whidbey Island; Keyport, Kitsap County. (Gardner). Cal- 

 ifornia. Common. On rocks, wharves and other algae. (Anderson). On 

 grass and weeds, salt marsh. Alameda. April 1904. (Gardner). West 



