142 YORKSHIRE NATURALISTS UNION. 



N.W.— Cautley Spout. Cronkley Fell. Lund's Fell. 



N.E. — Carlton Bank. 



S.E. — -Riccall Common. Market Weighton. 



700. Nostoc cceruleum Lyngb., 1819. 

 Mid W.— Baildon. 



N.W.— Mickle Fell. Great Shunnor Fell. 



701. Nostoc pruniforme Ag., 1812. 



Mid W. — Beamsley Beacon. Penyghent (iv., 1896). Malham 

 Tarn, 1789, recorded as Ulva pniniforviis (see Camden's 

 Britannia, enlarged edit., by R. Gough, iii. p. loi). 



702. Nostoc verrucosum Vauch., 1803. 

 Mid W.— On rocks, Malham Cove (H. F. Parsons). 

 N.W.— Mickle Fell. 



703. Nostoc sphsericum Vauch., 1803. 

 S.W.— Near Bradford. 



Mid W. — Ingleton. Holden Gill, near Keighley. 



Genus ANAB^NA Bory, 1822. 

 Sterile species from Frizinghall; Cam Fell; Pilmoor, near 

 Thirsk. 



704. — Anabaena Flos-aquae (Lyngb., i8i9)Breb.,i835. 

 S.E. — Hornsea Mere. 



705. — Anabaena circinalis(Kiitz., 1845) Rabenh., 1852. 

 N.E.— Strensall (W. B. Turner). 

 706.— Anabaena oscillarioides Bory, 1822. 



[Syn. SpJmrozyga Ralfsii 'X\\\^'x\\.Q.%^ 1849]. 

 Mid W.— Ilkley (vi., 1897). 

 S.E. — Newsholme. 



Var. elongata (Kiitz., 1849) Born, et Flah. [Syn. 

 Cylindrospernuim elojigatum Kiitz., 1849; Sphcerozyga 

 elasticha Ralfs, 1850; 6'. leptosperma Ralfs, 1850]. 

 N.W.— Mickle Fell. 



707. Anabaena laxa (Rabenh.) A. Braun. 

 S.W. — Cragg Vale, towards Blackstone Edge. 

 This species has not previously been recorded for the British 

 Isles. 



Trans. Y.N.U., 1899 (pub. July 1901). Bot. Series, Vol. 5. 



