1 52 Minnesota Algae 



remote, evidently constricted at the joints; apical cell scarcely tapering, 

 rotund; cells in lower portion of trichome up to double the diameter in 

 length, in the upper portion somewhat quadrate, 6-14 mic. in length; cell 

 contents coarsely granular, blue-green. 



West Indies. Wet rocks. Summit of Mount Junque, Sierra de Luquillo, 

 Porto Rico. (Sintenis). 



293. Schizothrix purpurascens (Kuetzing) Gomont. Monogr. Oscill. 58. 



pi. 9. f. 6-8. 1893. De Toni. Syll. Algar. 5: 361. 1907. 



Plate VI. fig. 20, 21. 



Plant mass indefinite, expanded, dark violet; filaments moderately 

 long, somewhat dichotomously divided and branched into more or less 

 divaricate portions, in lower portions entangled, in upper parts forming 

 somewhat parallel and twisted creeping tufts; sheaths purple, orange or 

 rose-colored, transparent at the apex, firm, solid, very thick and especially 

 lamellose, irregular and roughened in outline, with pointed apex; trich- 

 omes 6-8 mic. in diameter, usually constricted at the joints, numerous 

 within the sheath, somewhat remote and parallel; apical cell conical, often 

 sharply pointed; cells 3-8 mic. in length; cell contents coarsely granular 

 (except in apical cell). 



Var. cruenta (Lespinasse) Gomont. 1. c. S9- De Toni. 1. c. 362. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 11. no. 504. 1898. 

 Collins. Notes on Algae. — I. Rhodora. i: 10. 1899. 



Sheaths purplish pink or peach-colored; trichomes usually constricted 

 at joints. 



Massachusetts. On moist ground near Winchester Reservoir, Middle- 

 sex Fells. August, September 1898. (Collins). South Carolina. (Raven- 

 el). 



294. Schizothrix chalybea (Kuetzing) Gomont. Monogr. Oscill. S7- pl- 9- 



f- 3-S. 1893- De Toni. Syll. Algar. 5: 359. 1907. 



Plate VI. fig. 22. 



Plant mass indefinite, woolly, lead-colored; filaments moderately long, 

 branched, waving, loosely coalesced in erect tufts 2 mm. long; false 

 branches somewhat dichotomous, appressed; sheaths very thick, lamellose, 

 the inner layers pale lead-colored, the outer ones transparent, firm, cylin- 

 drical, smooth or a little roughened on the outside; trichomes 7.5-8.5 mic. 

 in diameter, very much constricted at joints; few and parallel within 

 the sheath, or often solitary; apical cell up to 11 mic. in length, obtuse 

 cr acute conical; cells 3-8 mic. in length; cell contents coarsely granular 

 (except in apical cell), dark green in color. 



Mexico. On mossy ground, near the Volcano of Orizaba. (Mueller). 



295. Schizothrix muelleri Naegeli in Kuetzing. Spec. Algar. 320. 1849. 



Gomont. Monogr. Oscill. 59. pl. 10. f. 5-7. 1893. De Toni. Syll. 

 Algar. 5: 362. 1907. 



Wolle. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: 138. 1877. 



