W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 145 



drawn "from the original specimens." Our specimens also agree 

 in every detail with Lyngbya Marteiisiana with the exception 

 that the dissepiments are quite distinct, and we do not consider 

 this fact to be of any specific value, more especially as some of 

 the trichomes were breaking up into their component cells 

 previous to the latter leaving the sheath; this condition of the 

 plants might probably account for the distinctness of the dissepi- 

 ments. From this we must regard Oscillatoria turfosa Carm. as 

 synonymous with Lyngbya Martensiana Menegh. 



718. Lyngbya aerugineo-ccerulea (Kiitz., 1843) 

 Gomont, 1893. 



S.W.— Horton Park, Bradford. 



Mid W. — Waterfall, Crook Gill near Buckden. Simon's 

 Fell (iv. 1892). Boston Spa. On wet rocks, in stream, Penyghent. 

 Linn Gill. 



N.W. — On stones, waterfall in gill, Dodd Fell. 



719. Lyngbya subtile West. 

 Mid W. — Wigton Moor. 



720. Lyngbya ochracea (Kiitz., 1843) Thur., 1S75. 



[Syn. Leptothrix ochracea Kiitz., 1843]. 



S.W.— Keighley. Hunslet (W. B. Turner). Frizinghall. 

 Clayton. 



Mid W.— Blubberhouses (W.B.Turner). Harrogate. Cocket 

 Moss, near Giggleswick. 



N.E.— Strensall (W. B. Turner). Terrington. 



721. Lyngbya Lagerheimii (Moebius, 1889) Gomont, 



1890. 

 Mid. W. — Penyghent. 

 S.E. — Skipwith Common. 



This species has not previously been recorded for the British 

 Isles. 



722. Lyngbya major Meneghini, 1837. 

 N.E. — Terrington. 



This species has not previously been recorded for the British 

 Isles. 



