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 pruniformis (see Camden's 

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



702. Nostoc verrucosum Vauch., 1803. 

 Mid W. — On rocks, INIalham 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.,i83s. 

 S.E. — Hornsea Mere. 



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

 N.E.— Strensall (W. B. Turner). 

 706. — Anabaena oscillarioides Bory, 1822. 



[Syn. Sph(erozyga Ralfsii T\\y!A\tes, 1849]. 

 Mid W.— Ilkley (vi., 1897). 

 S.E. — Newsholme. 

 Var. elong-ata (Kiitz., 1849) Born, et Flah. [Syn. 

 Cylindrospermum elongatum Kiitz., 1849; Sphierozyga 

 elasticha Ralfs, 1850; S. leptosperina 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. Senes, Vol. 5. 



