LYNGBY. 259 
Osecillatoria ochracea, Grev. Fl. Edin. 804. Harv. Man. 
167. Eng. Fl. v., 378. Eng, Bot. ii, 187. Johnst. Fi. 
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. (Kutz.) 
Deep blue green, with a whitish grumous membranaceous 
substratum, trichomes curved rather rigid, pale blue green, 
rarely fasciculate, sheaths narrow, joints shorter than their 
diameter, dissepiments naked (not granulated), extreme apex 
straight obtuse. 
Sizz. Trichomes ‘004 mm. diam. 
Phormidium inundatum, Kutz, Tab. Phyc. i, t. 45, f. 38. 
Rabh. Alg. Eur, ii., 116. 
Oscillaria autumnalis, 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, striz not very evident, a variety is com- 
mon on clayey ground, which occurs in small circular patches about an 
inch or two in diameter.”—Harvey. 
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 CII, fig. 8. Portions of trichomes X 400, 
Lyngbya vulgaris. Kirch. Alg. Schl. 242. 
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. Phye. i, t. 46, fig. 4. Rabh, 
Alg. Eur, it, 119. 
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