Myxophyceae 63 



dora. 2: 42. 1900; The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 

 239. 1901. Snow. The Plankton Algae of Lake Erie. U. S. Fish Comm. 

 Bull, for 1902. 22: 392. 1903. Setchell and Gardner. Algae of Northwest- 

 ern America. Univ. Calif. Pub. Bot. i: 182. 1903. Collins. Phycological 

 Notes of the late Isaac Holden. — II. Rhodora. 7: 235. 1905. Collins, 

 Holden and Setchell. Phyc. Bor.-Am. Fasc. 26. no. 1253. 1905. Brown. 

 Algal Periodicity in certain ponds and streams. Bull. Torr. Bot. Club. 35: 

 243, 247. 1908. Buchanan. Notes on the Algae of Iowa. Proc. Iowa Acad. 

 Sci. 14: 15. 1908. Tilden. American Algae. Cent. VII. Fasc. i. no. 649. 

 1909. 



Plate IV. fig. 3. 



Plant mass dark green or black; trichomes 16-60 mic. in diameter, 

 straight, rigid, fragile when dried, not constricted at joints, slightly taper- 

 ing, more or less curved and somewhat truncate at apex, somewhat capi- 

 tate; apical cell convex above; calyptra none; cells 3.5-7 mic. in length; 

 transverse walls never granulated; cell contents finely granular, rarely 

 showing coarser granules. 



Canada. High Park, Toronto. (Mackenzie). United States. Frequent 

 in ponds and pools from Maine to Florida. (Wolle). Massachusetts. 

 Floating on quiet pool. Saugus. (Collins). Cambridge. July 1890. (Farlow). 

 Rhode Island. Common. (Bennett). Connecticut. Bruce's Brook; Fresh 

 Pond. July, September, October; resting on muddy bottom and floating in 

 considerable masses on the surface of quiet water. Parrott's Pond, Bridge- 

 port. July 1892. (Holden). New Jersey. Frequent in ponds and pools. 

 Cape May; Dennisville. (Wolle). Pennsylvania. Bethlehem. August 1877. 

 (Wolle). Alabama. Auburn. May 1896. (Baker). Indiana. In ponds 

 near Bloomington. June to November. (Brown). Ohio. In washings of 

 stones and of plants growing in lake. Lake Erie. (Snow). Wisconsin. 

 In a brook. Near Madison. (Trelease). Minnesota. Bridal Veil Falls, 

 Minneapolis. June 1894. (Tilden). Iowa. Fayette. (Fink). Ames. (Bessey). 

 Pond, amid dense growth of L e m n a. Eagle Grove. (Buchanan). Ne- 

 braska. Occasionally found among other algae in the Dismal River region 

 and in many places in the eastern part of the state. (Saunders). Wyo- 

 ming. "Forming a black, thick floating mass in mountain stream at vent 

 of hot spring. Gradually runs out, being replaced by green at a distance 

 of fifty feet from vent. Temperature five feet from spring 42° C; fifty feet 

 from spring 38° C." Mountains near Nez Perces Creek, Lower Geyser 

 Basin. June 1896; forming dark green velvety mass fringing edge of smal/ 

 mountain creek where a hot spring flows out just underneath the bank. 

 Temperature of water one inch below surface 19° C; on surface 58° C. 

 Near Emerald Pool. Upper Geyser Basin. July 1896. Yellowstone National 

 Park. (Tilden). Washington. In pond on shore of lake. Green Lake, 

 King County. July 1897. (Tilden). West Indies. Guadeloupe. (Maze and 

 Schramm). In river near "Coamo." Porto Rico. (Sentenis). In mats in 

 stream. St. Ann's Bay. Jamaica. March 1893. (Humphrey). Bath, Jamaica. 

 July 1900. (Pease and Butler). 



Forma purpurea Collins in Collins, Holden and Setchell. Phyc. Bor.- 



