252 OSCILLATORE*:. 



12. OSCILLATORIA MUSCORUM Ag. 



Plate LXXII. Fig. 12. 



Char. Stratum dark ceruginous green, shortly radiating, creep- 

 ing over mosses. Filaments thickish, pale blue green. 

 Striae distant. 



O. muscorum Ag. Syst. p. 375.; Harv. Hook. Br. Flor. 

 365. ; Manual, p. 164. 



Hab. On Hypnum ruscifolium in rapid streams : Captain 

 Carmichael. 



" Stratum three or four inches in extent, closely inter- 

 woven with the branches and leaves of mosses, of a bluish 

 green colour, and slightly lubricous. Filaments a line or two 

 in length, variously curved, and radiating. Striae at the 

 distance of a diameter from each other." Carm. MS. Fila- 

 ments brittle, about equal in diameter to those of O. turfosa, 

 and when examined in the dried state, usually found to be 

 much broken up, with the striae all but invisible. 



b. Filaments Jlexuous, coriaceous. 



13. OSCILLATORIA CORIUM Ag. 



Char. " Stratum thick, subcoriaceous, opaque, dull brownish, 

 streaked with pale green. Filaments yellowish, slender. 

 Striae indistinct, distant." Harv. 



O. corium Grev. Flor. Edin., p. 303. ; Harv. Hook. Br. Fl. 

 p. 377.; Harv. Manual, p. 166. 



Hab. On the rocky bottoms of alpine rivulets. 



" Stratum thick, tough, dull brownish ; occasionally 

 streaked with pale green, which in some varieties is the pre- 

 vailing colour, slightly glossy when dry; filaments slender. 

 In some situations it radiates in fascicles from its whole upper 

 surface ; in others, it is found almost denuded of radii, and 

 forming a compact leathery stratum." Harv. 



