Myxophyceae 103 



form; apex of trichome straight, not capitate; apical cell scarcely tapering, 

 truncate, with outer membrane scarcely thickened; cells 4-9 mic. in length; 

 transverse walls not granulated, sometimes obscured by protoplasmic gran- 

 ules; cell contents' granular, blue-green. 



Newfoundland. On moss in stream, swift water, running into Torbay 

 Harbor, Torbay. July 1897. (Holden). New Hampshire. On walls of the 

 "Flume" and in quieter parts of the stream. (Collins). Rhode Island. 

 Geneva. (Bennett). Connecticut. Forming dark bluish-purple gelatinous 

 patches, often of considerable extent, on rocks in swiftly ilowing current. 

 Quinebaug River, Lisbon. September 1892. (Setchell). Stream just below 

 paper mill. Pequonnock River; Rooster River, Bridgeport. June, July, Sep- 

 tember. (Holden). Florida. (Smith). Alabama. Auburn. March 1897. 

 (Baker). Texas. 1902. (Fanning). Wisconsin. Forming membrane on 

 sides of casing of spring. Osceola. September 1894. (Tilden). Minnesota. 

 In ponds. Minnesota Point, Duluth. August 1901. (Tilden). Washington. 

 Growing on a submerged log. Green Lake, Seattle. (Gardner). West 

 Indies. In tufts on plants. Rio Cobre, Bog Walk, Jamaica. 1893. (Humphrey). 



Forma fasciculatum Gomont. 1. c. 197. De Toni. 1. c. 243. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 26. no. 1254. 1905. 

 Collins. Notes on Algae. — VII. Rhodora. 8: 122. 1906. 



Fascicles attached at base, penicillate or tufted, branched, floating. 



Massachusetts. In long masses in quick running water. Inlet of Walden 

 Pond, Lynnfield. June 1905. (Collins). 



Forma rupestris (Kuetz.) Gomont. 1. c. 197. De Toni. 1. c. 242. 



Wolle. Fresh Water Algae. Bull. Torr. Bot. Club. 6: 283. 1879; Fresh- 

 Water Algae U. S. 300. pi. 202. f. 58. 1887. Wolle and Martindale. Algae. 

 Britton's Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 608. 

 1889. 



Trichomes constricted at joints near the apices. 



New Jersey. On rocks. Bergen, Palisades. (Wolle). Maryland. Form- 

 ing a matted stratum on rocks. Garrett County. (Smith). 



204. Phormidium ambiguum Gomont. Monogr. Oscill. 198. pi. 5- i- 10. 1893- 

 De Toni. Syll. Algar. 5: 240. 1907. 



Tilden. List of Fresh-Water Algae collected in Minnesota during 1895. 

 Minn Bot. Studies, i: S99. 1896; American Algae. Cent. II. no. 184. 1896. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 6. no. 254. 1897- 

 Collins. Preliminary Lists of New England Plants.— V. Marine Algae. 

 Rhodora 2: 42. 1900. Bessey, Pound and Clements. Additions to the 

 Reported Flora of the State. Bot. Surv. Nebraska. S: U- iQOi. Setchell 

 and Gardner. Algae of Northwestern America. Univ. Calif. Pub. Bot. l: 

 185. 1903. 



Plate V. fig. 5- 



Plant mass more or less expanded, dark or yellowish green or blue- 

 green- filaments elongate, flexuously curved, variously entangled; sheaths 

 firm or mucous and diffluent, at times thick and lamellose; trichomes 4-6 

 mic in diameter, slightly constricted at joints; apex of tnchome straight. 



