OSCILLATORIA. 253 



14. OSCILLATORIA TURFOSA Carm. 



Plate LXXII. Fig. 6. 



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

 ceous substratum. Filaments slender, curved. Striae 

 distant. 

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



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

 Carmichael. Near Dolgelley : Mr. Rolfs. 



11 This species grows in a thick 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 very slender, more or less curved, and mostly hya- 

 line at the point." Carm. MS. The filaments are nearly 

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

 they may be distinguished by their greater tenacity and 

 length. Sometimes the endochrome is discharged from a 

 portion of a filament. 



15. OSCILLATORIA SUBFUSCA Vauch. 

 Plate LXXII. Fig. 9. 



Char. Stratum dull greyish brown, somewhat streaked ivith 

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

 Striae inconspicuous. 



O. subfusca Vauch. Hist, des Conf. ; Lyngb., t. 26.; 

 Harv. in Br. Flor. 377.; Harv. in Manual, p. 166. 



Hob. Rocks and stones in sub-alpine rivulets. 



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

 dusky grey colour." Carm. It differs from O. corium 

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

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

 in the dried specimens wholly invisible. 



