Myxophyceae ^53 



(Hydrocoleum versicolor Rabenh.). Farlow. Notes on the 

 Gryptogamic Flora of the White Mountains. Appalachia. 3: 236. 1883. 

 (Microcoleus versicolor Thur.). Collins. Algae of Middle- 

 sex County. 15: 1888. Collins, Holden and Setchell. Phyc. Bor.-Ara. 

 Fasc. I. no. 7. 1895. Collins. Algae. Flora of the Blue Hills, Middlesex 

 Fells, Stony Brook and Beaver Brook Reservations of the Metropolitan 

 Park Commission, Massachusetts. 126. 1896. Setchell. Notes on Cyano- 

 phyceae. III. Erythea. 7: 45. 1899. Collins. The Algae of the Flume. 

 Rhodora. 6: 230. 1904. 



Plate VI. fig. 23. 



Filaments long, moderately ilexuous, divided and branched into ap- 

 pressed portions, woven into an indefinite, expanded, dark or blackish 

 green mass, or forming decumbent tufts attached to mosses, or floating 

 free; sheaths yellowish orange, firm or somewhat diffluent, irregular in 

 outline, with pointed apex, trichomes 7-13 mic. in diameter, slightly con- 

 stricted at joints, solitary or few within the sheath; apical cell obtuse 

 conical; cells 4-9 mic. in length; cell contents coarsely granular. 



New Hampshire. Mt. Tumble-Down Dick. (Farlow). In thin black 

 sheets on wall of the "Flume." (Collins). Massachusetts. Forming a 

 black coating on wet rocks. Middlesex Fells; on perpendicular cliffs, form- 

 ing sheets of considerable size, Saugus, April 1890, 1893. (Collins). Con- 

 necticut. Mount Carmel. (Setchell). California. Along the banks of a 

 small stream on Howell Mt., near St. Helena, Napa County. February 1896. 



296. Schizothrix braunii Gomont. Monogr. Oscill. 63. pi. 11. f. 9-13. 1893. 



De Toni. Syll. Algar. S: 365. 1907. 

 Setchell and Gardner. Algae of Northwestern America. Univ. Calif. 

 Pub. Bot. i: 189. 1903. 



Plate VI. fig. 24. 



Plant mass crustaceous-floccose, adhering to paper when dried, black- 

 ish; filaments very long, densely tangled and twisted into cords, moderate- 

 ly branched; sheaths dark lead-colored, firm, slightly irregular in outline, 

 not fringed, with very gradually tapering apex; trichomes 1.7 mic. in diame- 

 ter, constricted at joints, few within the sheath, often solitary, distant, 

 parallel; apical cell tapering, obtuse; cells 2-5 mic. in length; transverse 

 walls granulated; cell contents pale blue-green. 



Alaska. On dripping rocks. Near Iliuliuk. (Setchell and Lawson). 

 Orca. (Jepson). "Most of the sheaths are colorless, but some are of the 

 characteristic blue-black color of this species." — Setchell and Gardner. 



297. Schizothrix rupicola Tilden. American Algae. Century II. no. 175. 



1896; Some New Species of Minnesota Algae which live in a Cal- 

 careous or Silicious Matrix. Bot. Gaz. 23: 103. pi. 9. f. 9. 1897; 

 List of Fresh-Water Algae collected in Minnesota during 1896 and 

 1897. Minn. Bot. Studies. 2: 28. 1898. 



Plate VI. fig. 25. 



Filaments 9.6-16 mic. in diameter, forming a loose, cobwebby mass 



