OSCILLATORIA. 253 



14. OSCTLLATORIA TURFOSA Carm. 



Plate LXXII. Fig. 6. 



Char. Stratum pale verdigris green, glaucous, with an oclira- 

 ceous substratum. Filaments slender, curved. Striaj 

 distant. 

 O. turfosa Harv. in Hook. Br. Flor. ; Ilarv. in Manual. 

 Hal. On floating sods in old turf pits. Appin : Capt. 

 Carmichael. Near Dolgclley : Mr. Ralfs. 



" This species grows in a tliick intensely green layer, over a 

 tough slimy ochre-coloured substratum. It entirely enveloped 

 the sods, some of which were a foot and a half in diameter. 

 Filaments veiy slender, more or less curved, and mostly hya- 

 line at the point." — Carm. 3IS. The filaments are nearly 

 equal in size to those of O. muscorum, from wliich, however, 

 they may l)e distinguished by their greater tenacity and 

 ■length. Sometimes the endoclurome is discharged from a 

 portion of a filament. 



15. OSCILLATORIA SUBFUSCA Vauch. 



Plate LXXII. Fig. 9. 



Char. Stratum dull greyish brown, somewhat streaked zvith 

 green; soft, green, fragile. Filaments verg slender. 

 Stria? inconspicuous. 

 0. suhfusca Vauch. Hist, des Conf. ; Lyngb., t. 2G. ; 

 Harv. in Br. Flor. 377. ; Harv. in Manual, p. 16G. . 



' Hah. Rocks and stones in sub-alpine rivulets. 



Stratum " soft, slimy, void of tenacity, wrinkled ; of a 

 dusky grey colour." — Carm. It diflfers from O. corium 

 " chiefly in being more gelatinous and fragile." — Harv. 

 The filaments are very slender, long, much curved. Striaj 

 in the dried specimens Avholly invisible. 



