LYNGBY.E. 259 



Oscillatoria ochracea, Grev. Fl. Edin. 304. HaiT. Man. 

 167. Eng. Fl. v., 378. Eng. Bot. ii., 187. Johnst. Fl. 

 Berw. ii., 264. Mack. Hib. 240. Fl. Dev. ii., 57. Gray. 

 Arr. i., 281. 



In boggy pools. 



This species is common in boggy pools " where it occurs in cloud -like 

 masses, scarcely to be called strata, the filaments are very slender and 

 scattered without order. Dillwyn's figure incorrectly represents the 

 filaments as branched." 



Plate CII. fig. 4. Trichomes X 400. 



Lyngbya inundata. (A'wfo.) 



Deep blue green, with a whitish grumous mernbranaceous 

 substratum, trichoines curved rather rigid, pale blue green, 

 rarely fasciculate, sheaths narrow, joints shorter than their 

 diameter, dissepiments naked (not granulated), extreme apex 

 straight obtuse. 



SIZE. Trichomes '004 mm. diam. 



Phormidium inundatum, Kutz. Tab. Phyc. i., t. 45, f. 3. 

 Eabh. Alg. Eur. ii., 116. 



Oscillaria autumnalts, Carm. (partly). Harv. Man. 165. Hass, 

 Alg. 251, t. 72, f. 7. 



Margin of ditches, by moist roads, on flowerpots, &c. 



" Stratum extensively spreading, very dark and lubricous, glossy when 

 dry, filaments remarkably pale, stiise not very evident, a variety is com- 

 mon on clayey ground, which occurs in small circular patches about an 

 inch or two in diameter.'' Harveij. 



The filaments in Carmichael's specimens are not more than half the 

 diameter of those in Lyngbya vulgaris, to which species they are usually 

 referred, 



Plate GIL fig. 8. Portions of trichoines X 400. 



Lyngbya vulgaris. Kirch. Alg. Schl.2^2. 



Stratum thin, more or less expanded, mucilaginous, dark 

 coloured (olive, brown, yellow, steel blue or purplish) opaque or 

 shining, by age becoming thickened, but rarely lamellose, and 

 without a substratum being formed ; trichomes straight, rigid, 

 distinctly vaginate, joints equal to their diameter or shorter, 

 dissepiments delicately granulated, apex evidently attenuated, 

 now and then somewhat curved, naked. 



SIZE. Trichomes -0045- -0065 mm. with sheath -006--009 mm. 



Phormidium vulgare, Kutz. Tab. Phyc. i., t. 46, fig. 4. Rabh, 

 Alg. Eur. ii., 119. 



2 o 



