Myxophyceae 69 



of Bot. 27: 261. 1889. West. Some Oscillarioideae from the Plankton. 

 Journ. of Bot. 37: 337. pi. 400 a. 1899. 



Plant mass dull red; trichomes 16-24 mic in diameter, strai|;ht, con- 

 stricted at joints (?), apex of trichome briefly tapering, obtuse, capitate; 

 apical cell showing a slightly convex calyptra; cells 7-1 1 mic. in length; 

 cell contents homogeneous or slightly granular, pale or dark red. 



West Indies. (Maze and Schramm). In plankton. (Murray and Black- 

 man.) 



138. Oscillatoria margaritifera Kuetzing. Tab. Phyc. i: 31. pi. 43. f. 10. 1845. 



Gomont. Monogr. Oscill. 236. pi. 6. f. 19. 1893.1 De Toni. Syll 

 Algar. 5: 161. 1907. 



Mvurray. Catalogue of the Marine Algae of the West Indian Region. 

 Journ. of Bot. 27: 261. 1889. Collins. Preliminary Lists of New England 

 Plants. — V. Marine Algae. Rhodora. 2: 42. 1900. 



Plate IV. fig. II. 



Plant mass black; trichomes 17-29 mic. in diameter, straight, con- 

 stricted at joints, curved gradually and for some distance from, the end; 

 apex of trichome slightly tapering, obtuse; apical cell capitate; calyptra 

 slightly convex; cells 3-6 mic. in diameter; transverse walls lined with 

 granules; cell contents olive green. 



Massachusetts. Northern part of state. (Collins). West Indies. 



Guadeloupe. (Maze). 



139. Oscillatoria nigro-viridis Thwaites in Harvey. Phyc. Brit. Syn. 



XXXIX. no. 375. pi. 251. A. 1846-1851. Gomont. Monogr. Oscill. 

 237. pi. 6. f. 20. 1893. De Toni. Syll. Algar. 5: 161. 1907. 



Farlow. Marine Algae of New England. 33. 1881. (O. 1 i m o s a c h a- 

 lybea). West. Some Oscillarioideae from the Plankton. Journ. of Bot. 

 37: 337- 1899. Collins. Preliminary lists of New England Plants. — V. 

 Marine Algae. Rhodora. 2: 42. 1900. Collins, Holden and Setchell. Phyc. 

 Bor.-Am. Fasc. 22. no. 1056. 1903. Setchell and Gardner. Algae of North- 

 western America. Univ. Calif. Pub. Bot. i: 183. 1903. 



Plate IV. fig. 12. 



Plant mass very dark olive green; trichomes 7-11 mic. in diameter, 

 moderately long, somewhat straight, fragile, constricted at joints, curved 

 gradually and for some distance from the end; apex of trichome tapering, 

 obtuse; apical cell somewhat capitate, with convex and slightly thickened 

 outer wall; cells 3-5 mic. in length; transverse walls granulated; cell con- 

 tents pale green or olive. 



Maine. Forming a slimy layv on piles. Eastport. (Farlow). Forming 

 a black, very thin film on muddy beams under old tide mill. Harpswell. 

 July 1902. (Collins). Massachusetts. Northern part of state. (Collins). 

 Washington. In salt marshes. Whidbey Island. (Gardner). Seattle. (Foster). 

 West Indies. In plankton. (Murray and Blackman). 



