12. Oscillatoria muscorum Ag.
Plate L X X I I . Fig. 12.
Ghar. Stratum dark æruginous green, shortly radiating, creeping
over mosses. Filaments thickish, pale blue green.
Striæ distant.
O. muscorum Ag. Syst. p. 375.; Harv. Hook. Br. Flor.
365. ; Manual, p. 164.
Hab. On Hijpnum ruscifolium in rapid streams : Captain
Carmichael.
“ Stratum three or four inches in extent, closely Interwoven
Avith the branches and leaves of mosses, of a bluish
gi’cen colour, and slightly lubricous. Filaments a line or two
in length, variously curved, and radiating. Striæ at the
distance of a diameter from each other.” — Carm. M S . F ilaments
brittle, about equal in diameter to those of O. turfosa,
and Avhen examined In the dried state, usually found to be
much broken up, with the striæ all but invisible.
14. Oscillatoria turfosa Carm.
Plate L X X I I . Fig. 6.
Char. Stratum pale verdigris green, glaucous, with an ochra-
ceous substratum. Filaments slender, curved. Striæ
distant.
O. turfosa Harv. in Hook. Br. Flor. ; Harv. in Manual.
Hab. On floating sods in old tu rf pits. Appin ; Capt.
Carmichael. Near Dolgelley : Mr. Ralfs.
“ This species groAvs in a thick intensely green layer, over a
tough slimy ochre-coloured substratum. I t entirely enveloped
the sods, some of Avhich were a foot and a half in diameter.
Filaments very slender, more or less curved, and mostly hyaline
at the point.” — Carm. M S . The filaments are nearly
equal in size to those of O. muscorum, from which, hoAvever,
they may be distinguished by their greater tenacity and
length. Sometimes the endochrome is discharged from a
portion of a filament.
b. Filaments^ea-MOMS, coriaceous.
13. Oscillatoria corium Ag.
Char. “ Stratum thick, subcoriaceous, opaque, dull brownish,
streaked with pale green. Filaments yellowish, slender.
Striæ indistinct, distant.” — H arv.
O. corium Grev. Flor. Fdin., p. 303. ; Harv. Hook. Br. Fl.
p. 377.; Harv. Manual, p. 166.
Hah. On the rocky bottoms of alpine rivulets.
“ Stratum thick, tough, dull brownish ; occasionally
streaked with pale green, which in some varieties is the prevailing
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.
15. Oscillatoria subpusca Vauch.
Plate L X X I I . Fig. 9.
Char. Stratum dull greyish brown, somewhat streaked with
green; soft, green, fragile. Filaments very slender.
Striæ inconspicuous.
O. suhfusca Vauch. Hist, des Conf. ; Lyngb., t. 26. ;
Harv. in Br. Flor. 377.; Harv. in Manual, p. 166.
Hab. Rocks and stones In sub-alpine rivulets.
Stratum “ soft, slimy, void of tenacity, wrinkled ; of a
dusky grey colour.” — Carm. I t differs from O. corium
“ chiefly in being more gelatinous and fragile.” — Harv.
The filaments are very slender, long, much curved. Striæ
in the dried specimens Avholly invisible.