264 YORKSHIRE NATURALISTS' UNION. 



' Haw Wood, Gawthorpe ; T. W. Gissing.' Vide 'The 

 Flora of West Yorkshire,' p. 520. 

 1856. Nitella flexilis Ag. Ditch, Howley. 



Trans. Y.N.U., 1887 (pub. 1889). Series E. Vol. 3. 



