350 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



long, swollen to 100 //. in the middle ; emitting erect filaments, 

 cells 30-50 //, diam., 4-8 diam. long, cylindrical or irregular, 

 terminal cell obtuse or truncate ; slender descending rhizoids 

 sometimes issuing from lower cells of erect filaments. Cal. 



A dull green, unattractive plant, growing near extreme high 

 water mark, among Salicornia, in a salt marsh, and having much 

 the habit of Vaucheria. 



41. C. INTERTEXTA Collins, 1901, p. 243; P. B.-A., No. 

 8 1 8. Tufts densely matted, prostrate ; filaments 300-350 /x 

 diam., creeping over shells and sand; cells 1-1^2 diam. long, 

 rarely up to 3 diam.; bearing upright branches, about 200 //, 

 diam., simple or with a few short, secund ramuli ; terminal cells 

 blunt. Jamaica. 



Forming dense, tangled masses in the bottom of pools ; the 

 naked branches projecting, giving the whole the appearance of 

 a tangled mass of Chaetomorpha. 



42. C. GLOMERATA (Iy.) Kiitzing, 1845, p. 212; P. B.-A., 

 No. 1283. Fronds up to 30 cm. high, more or less densely 

 branched below, branches more and more frequent towards the 

 top, at last forming dense fascicles ; filaments cylindrical, 75- 

 100 ju, diam. below, 6-7 diam. long ; 35-50 /A diam. in the ramuli, 

 3-6 diam. long ; ramuli not tapering, tips rounded ; fruiting 

 cells terminal or subterminal. Fig. 124. 



An extremely variable species and not marked by any dis- 

 tinct lines from the four following species. Specimens distrib- 

 uted in P. B.-A., No. 1283, correspond fairly with the typical 

 form ; the plant distributed as C. glomerata, P. B.-A., No. 473, 

 belongs rather in forma rivularis ; No. 278, Tilden, American 

 Algae, is a quite elongate form ; a plant from the Mississippi 

 River, Winona, Minn., comes nearer to the type than to any of 

 the following varieties, and Tilden, American Algae, No. 35, C. 

 callicoma, probably belongs here. Wolle gives few definite 

 localities ; some specimens marked by him C. glomcrata have 

 been examined, but they are very imperfect and uncharacter- 

 istic. No. 32, Tilden, American Algae, is distributed as C. 

 glomerata var. fasciculata Rab. ; the only character distin- 

 guishing this from the type is found in the swollen terminal 

 cells ; but as this appears to be due to the formation of spores, 

 and is probably the same throughout the species, the varietal 

 name seems unnecessary. Var. clavata Wolle, 1887, p. 128, ap- 



