Myxophyceae 233 



New Hampshire. On submerged mosses. Mill Brook, Shelburne. (Far- 

 low). New Jersey, On moist rocks. Closter and Godwinville. (Austin). 



430. Tolypothrix byssoidea (Hassall) Kirchner in Engler and Prantl. Nat. 

 Pflanz. I. la. 80. 1900. Bornet and Flahault. Revis. des Nostoc. 

 Ann. Sci. Nat. Bot. VII. 5: 116. 1887. (Hassallia byssoidea 

 Hass.) De Toni. Syll. Algar. 5: 551. 1907. 



Wood. Contr. Hist. Fresh-Water Algae North America. 68. pi. 9. f. 

 I. 1872. (Sirosiphon s c y t o n e m a t o i d es Wood). WoUe. Fresh- 

 Water Algae U. S. 266. pi. 181. f. 8-11. 1887. (T. truncicola (Rab.) 

 Wolle). Collins. Algae of Middlesex County. 13. 1888. Setchell. Notes 

 on some Cyanophyceae of New England. Bull. Torr. Bot. Club. 22: 428. 

 1895. Collins. Algae. Flora of the Blue Hills, Middlesex Fells, Stony 

 Brook and Beaver Brook Reservations of the Metropolitan Park Com- 

 mission, Massachusetts. 128. 1896. Collins, Holden and SetcheU. Phyc. 

 Bor.-Am. Fasc. 6. no. 258. 1897. West and West. A Further Contribution 

 to the Freshwater Algae of the West Indies. Journ. Linn. Soc. Bot. 34: 

 287. 1 898- 1 900. 



Plate XIV. fig. 6. 



Plant mass woolly, cushion-like, brownish or black; filaments lo-lS 

 mic. in diameter, i mm. in length, irregularly branched; false branches 

 short, erect, spreading; sheaths close, thin, orange or brown, fragile, tubu- 

 lar, continuous; trichomes 9-1 1 mic. in diameter, constricted at joints; cells 

 two or three times shorter than the diameter; heterocysts, basal, one or 

 two; cell contents olive. 



Massachusetts. Newton. (Farlow). Among other algae. Cascade, Middle- 

 sex Fells. (Collins). Connecticut. Growing on rocks at the water's edge. 

 Quinebaug River, Lisbon. (Setchell). South Carolina. Growing on the 

 limbs ofMyrica cerifera. February. (Ravenel). West Indies. On 

 leaves. Wotten Waven, Dominica. (Elliott). 



Forma saxicola Grunow. Bornet and Flahault. 1. c. 117. De Toni. 1. c. 

 552. 



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

 Pub. Bot. i: 195- 1903. 



Filaments 14-18 mic. in diameter; sheaths often striated and corrugated; 

 trichomes 12 mic. in diameter. 



Alaska. Among mosses on dripping rocks. Amaknak Island, Bay of 

 Unalaska. (Setchell and Lawson). 



Forma cylindrica Tilden. American Algae. Cent. IV. no. 398. 1900. 

 (Hassallia byssoidea cylindrica). 



Trichomes 5-6 mic. in diameter, cylindrical; heterocysts basal or inter- 

 calary. 



Canada. On vertical rocks just above high tide. Baird Point, Strait of 

 Juan de Fuca, Minnesota Seaside Station, Vancouver Island, British Co- 

 lumbia. August 1898. (Tilden). 



