loo Minnesota Algae 



Algae collected in Minnesota during 1895. Minn. Bot. Studies, i: 599. 1896. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 22. no. 1057. 1903. 



Plate IV. fig. 68. 



Plant mass encrusted with lime, crustaceous, very hard, dark red or 

 violet; filaments curved, entangled or erect-parallel; sheaths thin, mucous, 

 agglutinated; trichomes 4-5 mic. in diameter, not constricted at joints; 

 apex of trichome straight, briefly tapering, not capitate; apical cell obtuse- 

 conical; calyptra none; cells 3.5-5.2 mic. in length; transverse walls usually 

 visible, sometimes granulated; cell contents showing scattered granules. 



Wisconsin.. In stream. Osceola. August 1895. (Tilden). California. 

 On the sides of a water trough. Berkeley. September 1902. (Osterhout 

 and Gardner). 



Var. cataractarum (Naeg.) Gomont. I. c. 190. De Toni. 1. c. 231. 



Wolle. Fresh-Water Algae. U. S. 302. pi. 202. f. 18, 19. 1887. WoUe 



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

 Geol. Surv. N. J. 2: 608. 1889. Brown. Algal periodicity in certain ponds 

 and streams. Bull. Torr. Bot. Club. 35: 248. 1908. Buchanan. Notes on the 

 Algae of Iowa. Proc. Iowa Acad. Sci. 14: 13. 1908. 



Filaments erect-parallel. 



New Jersey. In rapid waters. (Wolle). Pennsylvania. Frequent at 

 waterfalls, mill dams, etc., sometimes in cushion-like masses, two or three 

 inches in thickness. (Wolle). Indiana. Jordan Branch, Bloomington. 



March to August 1907. (Brown). Iowa. Iowa City. (Hobby). 



198. Phormidium inundatum Kuetzing. Spec. Algar. 251. 1849. Gomont. 



Monogr. Oscill. 192. pi. 4. f. 31, 32. 1893. De Toni. Syll. Algar. 



5: 232. 1907. 



Wolle. Fresh-Water Algae. VI. Bull. Torr. Bot. Club. 9: 25. 1882; Ex- 



sicc. no. 108. (O. a n 1 1 i a r i a) ; Fresih-Water Algae U. S. 303. pi. 202. 



f. 24, 25. 1887. (L. i n u n d a t a Kg.) Bennett Plants of Rhode Island. 



114. 1888. Setchell. Notes on Cyanophyceae. — III. Erythea. 7: 53. 1899. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 21. no. 1002. 1903. 



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



Bot. i: 185. 1903. Tilden. American Algae. Cent. VII. Fasc. i. no. 642. 



1909. 



Plate IV. fig. 69, 70. 



Plant mass membranaceous, blue-green; filaments somewhat straight, 

 fragile; sheaths thin, diffluent into an amorphous mucus; trichomes 3-5 

 mic. in diameter, straight or curved, not constricted at joints; apex of 

 trichome straight, briefly tapering, not capitate; apical cell obtuse conical; 

 calyptra none; cells 4-8 mic. in length; transverse walls covered by proto- 

 plasmic granules. 



United States. (Farlow). Margins of wayside ditches and the like. 

 (Wolle). Rhode Island. Geneva. (Bennett). South Carolina. On moist 

 earth. (Ravenel). Montana. On bottoms of dried alkali ponds. Billings. 

 September 1898. (Williams and Griffiths). Washington. On a dripping 

 water pipe. Seattle. May 1901. (Gardner). 



