260 NEMATOGENE. 
Oscillatoria autumnalis (partly), Eng. Fl. v., 376. Fng. Bot. 
ii., 187. Jenn. Tunb. Wells 188. Grev. Fl. Edin. 305. 
Harv. Man, 165, Mack. Hib., 239. 
Conferva decorticans, Dillw. Conf. t. 26. 
Oscillatoria decorticans, Grev. Fl. Edin. 804. Eng. Fi. v., 
375. Eng. Bot. ii, 187. Jenner Tunb. Wells 188. Harv. 
Man. 164. Mack. Hib. 239. Hass. Alg. 257, t. 71, f. 10. 
Humida decorticans, Gray. Arr. i., 282. 
On moist naked ground after rain. 
Plate CII. fig. 5. Portion of trichomes X 400; jig. 6, variety 
myochroum x 400. 
Lyngbya papyrina. Kirch. Alg. Schl. 241. 
Forming a thin papery stratum, sometimes shortly radiating, 
with a pallid or brownish fibrillose substratum, formed from 
the interlaced empty sheaths, trichomes equal, joints nearly 
equal or a little shorter than their diameter, granulated at their 
junction, apex obtuse, straight, naked. 
Size. Trichomes ‘005-006 mm., with sheath -0075--009. 
Oscillaria papyrina, Bory. Dict. Sci. Nat. 
Phormidium papyrinum, Kutz. Tab. Phye. i, t. 41, fig. 3. 
Phormidium papyraceum, Rabh. Alg. Enr. ii., 125. 
Oscillatoria spadicea, Carm. Hass. Alg. 255, t. 71, f. 5, t. 
72,f.5, Eng. Fl. v., 378. Harv. Man., 167. 
In streams, torrents, aqueducts, canals, &c. 
The form met with by Carmichael was growing on damp mossy earth. 
He says “It occurs in a very thin dark green stratum spreading to the 
extent of several feet, and is hardly to be distinguished from the mossy 
earth on which it grows.” 
Plate CII. fig.7. Portions of trichomes X 400. 
Lyngbya rupestris. (4g.) 
Stratum compact, rather velvety, gelatinous, lamellose, very 
shortly radiating, bright blue green or becoming dark steel blue, 
the lower strata becoming discoloured and fibrillose; trichomes 
rigid, rather flexuous, a little torulose towards the apex, joints 
equal in length and breadth, very finely punctate, dissepiments 
granulated, extreme apex paler, sometimes bearded. 
Sizz. Trichomes :007--008 mm. diam. 
Phormidium rupestre, Kutz. Tab. Phye. i., t. 49, fig. 4. Rabh. 
Alg. Eur. ii., 122. 
Oscillaria rupestris, Ag. Syst. p. 63. Hass. Alg. 254., t. 
72, f. 11, Grev. Sc. Crypt. Fl. t. 246. Eng. Fl. v., 877, 
Harv. Man. 166. 
