Myxophyceae 257 



Algae. Bull. Torr. Bot. Club. 13: 105. 1886. Bennett. Plants of Rhode 

 Island. 95. 1888. Collins. Algae from Atlantic City, N. J. Bull. Torr. Bot. 

 Club. 15: 310. 1888; Marine Algae of Nantucket. S- 1888; Algae of Middle- 

 sex County. 13. 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. Anderson. List of California Marine 

 Algae, with notes. Zoe. 2: 218. 1891. Collins, Holden and Setchell. Phyc. 

 Bor.-Am. Fasc. i. no. 9. 1895. Collins. Preliminary lists of New England 

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

 Am. Acad. 37: 241. 1901. Lemmerman, E. Algenfl. Sandwich.-Inseln. Bot. 

 Jahrb. 34: 627. 1905. Collins. Phycological Notes of the late Isaac Hol- 

 den. — II. Rhodora. 7: 223. 1905. 



Plate XVI. fig. 6-8. 



Filaments gregarious, stellately fasciculate, attached to larger algae, rigid, 

 not thickened at the base, blackish green or lead-colored, 12-25 mic. in 

 diameter, 2-3 mm. in length; sheaths close, very often entirely colorless, 

 sometimes yellowish brown in lower parts, homogeneous, soft, gelatinous 

 in upper portions; trichomes 10-18 mic. in diameter; cells four or five times 

 shorter than their diameter; heterocysts one or two, basal; hormogones 

 numerous in the sheath, four to six times longer than their diameter. 



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

 New England. On algae of all kinds. Very common in summer. (Farlow). 

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



Enteromorpha intestinalis in ditches in salt marshes. Wood's 

 Hole. July 1892. (Setchell). "Parasitic" on various algae at Brant Point; 

 on Ulva in salt water, Medford, Everett. (Collins). Rhode Island. On 

 the filiform marine algae. (Bailey, Olney, Hunt). Connecticut. On R u p- 

 pia. Fresh Pond, August. (Holden). New York. Shores of Long Island. 

 In fresh and salt water. Bay Ridge, Fort Hamilton. Summer. Staten Island. 

 (Pike). New Jersey. On rockweed. Atlantic City. (Morse, Martindale). 

 Hudson: Hoboken and Communipaw. (Pike). New York Bay. (Hooper). 

 California. Common. (Anderson). West Indies. On various algae. Port 

 Antonio. Jamaica. March 1893. (Humphrey). Hawaii. On marine algae. 

 Laysan. 1896-1897. (Schauinsland). 



Var. purpurea Bornet and Flahault. 1. c. 350. De Toni. 1. c. 607. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 30. no. 1456. 1908. 

 Trichomes purple. 



Maine. On Cladophora expansa (Kuetz). In marsh pools. 

 Stover's Point. Harpswell. 13 July 1905. (Collins). 



464. Calothrix consociata (Kuetzing) Bornet and Flahault. Revis. des Nos- 

 toc. Ann. Sci. Nat. Bot. VII. 3: 3Si- 1886. De Toni. Syll. Algar. 

 5: 607. 1907. 



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

 Pub. Bot. i: 197. 1903. 



