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TRANSACTIONS OF THE VORKSHIRE NATURALISTS' UNION. 

 PART 23, -^ ^ 



ISSUED TO MEMBERS FOR THE YEAR i8q7.^>— tT^ 



/^' Zoolc 



11 iy4t 



THE 



ALGA-FLORA of YORKSHIRE 



A COMPLETE ACCOUNT OF THE KNOWN 



FRESHWATER ALG^ OF THE COUNTY. 



BY 



W. WEST, F.L.S., 



An Ex-President of the Yorkshire Naturalists' Union ; 

 AND 



G. S. WEST, B.A.. A.R.C.S., 



Hutchinson Research Student, and formerly Scholar of St. John's College, 



Cambridge ; Professor of Natural History at the Royal 



Agricultural College, Cirencester. 



CONTENTS 



oi" Second Instalment (Three Sheets). 



PAGES. 



Class Chlorophyce/e — 

 Order Conjugate — 



Family Uesmidiace/E — 



Genus Closterium ... ... ... 53 — 58 



Genera Docidium, Pleurota^nium 58 — 59 



Genera Tetmemorus, Euastrum ... 59 — 65 



Genera Micrasterias, Xanthidium 65—68 



Genus Cos.marium ... ... ... 68 — 95 



Genera Cosmocladium, Spondylosium 95 — 96 



Genus Staurastrum ... ... ... 96 — 100 



LEEDS : 



PRINIRD I'OK THE VORKSHIRE NATURALISTS' UNION 

 BY TAYLOR BROTHERS. 



DEC, 1900. 



