Oteillaloria.] ALG^l CONFEUVOIDE^. 375 



arachnoid straight or curved, striae wholly invisible. — Grev. 

 Fl. Edin. p. 304. 



In tubs of water, in the stove of the Botanical Garden, Edinburgh, 

 Dr. Greville.—" Filaments under the highest power of the microscope, 

 appearing not larger than a human hair and of a very pale bluish colour. 

 It has the colour and external characters of O. major, but cannot be 

 confounded with it when magnified." Grev. 



9. O. muscorum, Ag. {Moss- Oscillator id); stratum dark aeru- 

 ginose-green shortly radiating creeping over mosses, filaments 

 thickish pale blue-green, striae distant — Ag. Syst. Alg. p. 65. 



'* On Hypnum ruscifolium, in rapid streams," Captain Carmkhael. — 

 " Stratum 3—4 inches in extent, closely interwoven 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; stria? 

 at the distance of a diameter from each other." Carm. MSS. 



10. O. turfdsa, Carm. ( Turf Oscillatoria); stratum pale verdi- 

 gris-green glaucous with an oehraceous substratum, filaments 

 very slender curved hyaline, striae distant. 



" On a parcel of floating sods in an old turf-pit," Capt. Carmkhael.— 

 " This specks 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 hyaline at the point." Carm. It does 

 not adhere to paper in drying. 



11. O. decorticans, Grev. (Ribband Oscillatoria); stratum 

 smooth glaucous-green membranaceous, filaments very slender 

 curved pale bluish-green, striae distant. — Grev. Fl. Edin. 

 p. 304, (excl. syn. Lyngb.) — Conferva decorticans, Dillw. Conf. 

 t, 26. — (3. corticola ; stratum blackish green. O. corticola, Carm. 

 MSS. ' 



Damp walls, rotten timber, Sec, common. — /3. " on the trunk of an 

 old sycamore, where the rain-water trickled down." CapL Carmichacl. 



12. O. limbdta, Grev. (margined Oscillalor/r/); " filaments 

 thick flexuose Seruginose with a broad pellucid margin, loo-ely 

 interwoven in a dense dull eeruginose-green stratum." Grev, 

 Orypl. /V. Syn. p. 40. d t. 246, (O. rujxstris.) 



()n perpendicular rocks, exposed to the trickling of water, rentland 

 hills ; Dr. Greville.—*' Tlant covering the tare of the rock tor several 



inches together, and, win .1 old, peeling off in rather large pieces. Ex- 

 ternally, it i- mOStlj of a dull and often brownish-green colour; but within, 



more or less of a verdigris-green, differing in intensity in different ; 



here and there gelatinous and -eniilransparent. Filaments thick for 

 tlnir length, wr\ Rexuose, with a pellucid colourless limb, equal in 

 breadth to tin- coloured striated portion, which is of a pale verdigns- 

 green. w Gi\ v. 



13. O. li/lonilis, ('arm. (Short Oscilhitorin ); stratum \ivi.l 



eeruginose-green, filaments thick deep-green curved, stria <"n- 

 Bpicuoui close. 



