Myxophyceae 25 1 



in the Androscoggin River, Shelburne. (Farlow). On rocks just outside the 

 Flume. (Collins). Massachusetts. In a brook which empties into the sea 

 at Rafe's Chasm, Magnolia Cove, in Gloucester. (Farlow). On pebbles at 

 margin of Spot Pond, Cascade, Middlesex Fells. (Collins). Connecticut. 

 On damp rocks in Mill River, near Samp Mortar Rock; on stones in Pequon- 

 nock River. July. (Holden). New York. Round Pond, near West Point. 

 (Bailey). 



457. Sirosiphon brandegeei Wolle. Fresh-Water Algae U. S. 274. pi. 194. 



f. 17-27. 1887. De Toni. Syll. Algar. 5: 590. 1907. 

 Filaments 12-20 mic. in diameter, with somewhat pointed apices, red- 

 dish brown; cells in one, two or three rows. 



Colorado. On "'shores" of a soda spring. Cannon City (Brandegee). 



Genus CAPSOSIRA Kuetzing. Spec. Algar. 344. 1849. 



Plant mass hemispherical, cushion-like, attached by lower surface, 

 formed of filaments growing together laterally, aquatic; filaments erect, 

 branched, composed of a single row of cells; sheaths septate; heterocysts 

 intercalary and lateral; hormogones composed of from 10-20 cells; gonidia 

 spherical; wall of gonidium thick, brownish. 



458. Capsosira brebissonii Kuetzing. Spec. Algar. 344. 1849. Bornet and 



Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 5: 79- 1887. 



De Toni. Syll. Algar. 5: 592. 1907. 

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

 ell. Notes on some Cyanophyceae of New England. Bull. Torr. Bot. Club. 

 22: 427. 1895. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 26. 

 no. 1257. 1905. 



Plate XVI. fig. I. 



Plant mass crustaceous-confluent or hemispherical, 1-3 mm. thick, gelat- 

 inous, hard, blackish green, within showing concentric zones of green and 

 yellowish tints; filaments 7.5 mic. in diameter, straight, densely crowded, 

 irregularly branched, torulose; branches appressed, close, upright, fastig- 

 iate; sheaths thick, gelatinous, not lamellose, colorless or yellowish; cells 

 4-5 mic. in diameter, somewhat globose, distant; heterocysts lateral. 



New Hampshire. On shells. Lake Chocorua. September 1904. (Far- 

 low). Connecticut. Growing on a large rock on the eastern side of 

 Round Pond at Lantern Hill, near Mystic. (Setchell). 



Genus NOSTOCHOPSIS Wood. 

 Prodr. Fresh-Water Alg. N. A. 126. 1869. 



Plant mass or colony gelatinous, definite, aquatic; trichomes formed 

 of a single row of cells, branched; heterocysts intercalary and lateral, pedi- 

 cellate or sessile. 



459. Nostochopsis lobatus Wood. Prodromus of a Study of the Fresh- 



Water Algae of Eastern North America. 127. 1869; Contr. Hist. 

 Fresh-Water Algae North America. 45. pi. 3. f. 6. 1872. Bornet 



