Myxophyceae 145 



what diffluent; trichomes 1.4-2 mic. in diameter, constricted at joints, at 

 the base of the filament often numerous and closely crowded within the 

 sheath; cells 1-2.5 mic. in length; protoplasm fioccose, not granular, pale 

 blue-green. 



Connecticut. Forming a reddish, closely adherent crust on stones kept 

 moist by the spray from a waterfall, by dam across Still River, Brook- 

 field. May 1892. ("The red color was due to a unicellular organism asso- 

 ciated with it"). CSetchell). 



280. Symplocastrum rubrum (Meneghini) De Toni. Syll. Algar. 5: 350. 



1907. Gomont. Monogr. Oscill. 53. pi. 8. f. 15, 16. 1893. (S c h i z o- 

 thrix rubra Gom.). 



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

 Pub. Bot. i: 189. 1903. 



Plate VI. fig. 6. 



Plant mass caespitose, flesh-colored, reddish or becoming dark colored; 

 filaments elongate, divided and branched into numerous appressed por- 

 tions, in Lower parts twisted and entangled, above less flexuous, parallel, 

 forming short, erect, pointed tufts at the apex; sheaths cylindrical, firm, 

 wide, somewhat lamellose, slightly roughened on the surface, frequently 

 transversely wrinkled at the base with a very long, pointed apex; trich- 

 omes 1.6-2 mic. in diameter, constricted at joints (in dried specimens), few 

 or often solitary within the sheath; apical cell rotund; cells 2-3.5 ™ic. in 

 length; transverse walls often granulated; cell contents pale reddish. 



Alaska. Forming scum on deep pool of fresh water. Glacier Valley, 

 Unalaska. (Lawson). 



281. Symplocastrum cuspidatum (West and West). De Toni. Syll. Algar. 



5: 349- 1907. 

 West and West. On some Freshwater Algae from the West Indies. 

 Journ. Linn. Soc. Bot. 30: 273. pi. 16. f. 1-7. 1895. (Symploca cuspida- 

 tum W. and W.). 



Plate VI. fig. 7-9. 



Plant mass widely expanded, gray or yellowish; fascicles 8-15 mm. 

 in height, erect, narrow, awl-shaped, aggregated, here and there 

 dense, becoming bluish green; sheaths colorless, transparent or forming 

 parallel layers, often roughened in outline, narrower and often branched at 

 the apex; trichomes 1.9-2.3 mic. in diameter, flexuous, entangled, often 

 interrupted, narrower in the mass, at the apex of the fascicles one to 

 three included in the wide sheath, 13.5-25 mic. in diameter; cells 3.8-9 mic. 

 in length; transverse walls distinct; cell contents blue-green. 



West Indies. Specimens resembling Sphagnum cuspidatum. Occur- 

 ring among mosses on trees. Summit of Trois Pitons (4500 feet), Dominica. 

 (Elliott). 



Var. luteo-fusca West and West. A Further Confribution to the 

 Freshwater Algae of the West Indies. Journ. Linn. Soc. Bot. 34: 288. 1898- 

 1900. De Toni. 1. c. 349. 



