Myxophyceae 193 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 8. no. 354. 1897. Col- 

 lins. Preliminary Lists of New England Plants. — V. Marine Algae. Rhodora. 

 2: 41. igoo; Phycological Notes of the late Isaac Holden. — II. Rhodora. 7: 

 223. 1905. 



Plate IX. fig. 19. 



Plant mass mucous, thin, blue-green; trichomes 4.2-5 mic. in diameter; 

 apical cell acute conical; cells barrel-shaped, equal to or a little shorter 

 than the diameter; heterocysts 6 mic. in diameter, 6-10 mic. in length, some- 

 what spherical or ovoid; gonidia 7-12 mic. in diameter, 18-28 mic. in length, 

 short, somewhat cylindrical, often slightly constricted in the center, con- 

 tiguous to the heterocysts, developed centripetally; wall of gonidium 

 smooth, pale smoke-colored in mature specimens. 



Maine. On Z o s t e r a. Goose Creek marshes. Cape Rosier. July i8q6. 

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

 algae, looking like a shining emerald-green film. Wood's Hole; Gloucester; 

 Cambridge; salt marshes, Everett. (Farlow). Not uncommon on mud in 

 the harbor; on decaying Zostera marina, Mattapoisett, September 

 1906. (Collins). Rhode Island. (Collins). Connecticut. Noank. (Far- 

 low). On mud on margin of marsh pools. Cook's Point; on muddy sand, 

 near high water mark, among S p a r t i n a, shore of The Gut, June. (Hol- 

 den). New York. On decayed algae. Fort Hamilton; Greenport. (Pike). 

 Fresh water. Somerset; in pools. Bound Brook. (Wolle). New Jersey. 

 With other algae, forming a brownish jelly, in a poo! east of Camden. 

 (Wood). Newark Bay. (Pike). Atlantic City. (Morse, Martindale). Ne- 

 braska. In stagnant water, usually among other algae; also on damp 

 earth, on flower pots, in greenhouses at the University. Lincoln. (Saunders). 



356. Anabaena oscillarioides Bory. Dictionnaire Classique d'Histoire Natu- 

 relle. i: 308. 1822. Bornet and Flahault. Revis. des Nostoc. Ann. 

 Sci. Nat. Bot. VII. 7: 233. 1888. De Toni. Syll. Algar. 5: 45,1. 1907. 



Wood. Contr. Hist. Fresh-Water Algae North America. 40. pi. 3. f. i. 

 a, b. 1872. (Cylindrospermum flexuosum Rab.). Wolle. 



Fresh-Water Algae U. S. 292. pi. 199. f. 13. 1887. Bennett. Plants of 

 Rhode Island. 114. 1888. Wolle and Martindale. Algae. Britton's Cata- 

 logue of Plants found in New Jersey. Geol. Surv. N. J. 2: 607. 1889. Til- 

 den. American Algae. Cent. I. no. 87. 1894. Saunders. Protophyta-Phyco- 

 phyta. Flora of Nebraska. 19. 1894. Tilden. List of Fresh-Water Algae 

 collected in Minnesota during 1894. Minn. Bot. Studies, i: 236. 189s. Col- 

 lins. Algae. Flora of the Blue Hills, Middlesex Fells, Stony and Beaver 

 Brook Reservations of the Metropolitan Park Commission, Massachusetts. 

 128. 1896. Setchell. Notes on Cyanophyceae. III. Erythea. 7: 51. 1899. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 14. no. 656. 1900; Fasc. 

 19. no. 907. 1902. Kellerman. Proposed Algological Survey of Ohio. 



Ohio Nat. 2: 222. 1902. Setchell and Gardner. Algae of Northwestern 

 America. Univ. Calif. Pub. Bot. i: 192. I903- Collins. Phycological Notes 

 of the late Isaac Holden.— II. Rhodora. 7: 236. 1905. 



