260 NEMATOGEN-ffi. 



Osdllatoria autumnalis (partly), Eng. Fl. v., 376. Fug. Bot. 

 ii., 187. Jenn. Tunb. Wells 188. Grev. Fl. Edin. 305. 

 Harv. Man. 165, Mack. Hib., 239. 



Conferva decorticans, Dillw. Conf. t. 26. 



Osdllatoria decorticans, Grev. Fl. Edin. 304. Eng. Fl. v., 

 375. Eng. Bot. ii., 187. Jenner Tunb. Wells 188. Harv. 

 Man. 164; Mack. Hib. 239. Hass. Alg. 257, t. 71, f. 10. 



Hv mid a decorticans, Gray. AIT. i. ; 282. 



On moist naked ground after rain. 



Plate OIL fig. 5. Portion of trichonies X 400 ; fig. Q, variety 

 myocliroum x 400. 



Lyngbya papyxina. 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, trichonies 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. Diet. Sci. Nat. 



Phormidium papyrinum, Kutz. Tab. Phyc. i., t. 41, fig. 3. 



Phormidium papyraceum, Rabh. Alg. Eur. ii., 125. 



Osdllatoria 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 011 clamp 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 C1I. fig. 7. Portions of trichomes X 400. 



Lyngbya xupestxis. (Ag.) 



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. 



SIZE. Trichomes > 007-*008 mm. diani. 



Phormidium rupestre, Kutz. Tab. Phyc. 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., 377, 

 Harv. Man. 166. 



