tio Yorkshire xATUkAi.isTs' union. 



521. Onychonema Nordstedtianum Turn. 

 N.E — Stiensall ! (W. B. Turner). 



S.E. — Riccall Common, abundant. 



Genus SPH^ROZOS.MA Corda, 1835. 



522. Sphaerozosma vertebratum (Breb.) Ralfs. 

 S.W. — Rawcliffe Common (W. B. Turner). 



i\IiD \y. — Ingleborough. 



N.E. — Strensall (W. B. Turner). Pilmoor, near Thirsk, abun- 

 dant. 



S.E. — Riccall Common. 



523. Sphaerozosma excavatum Ralfs. 

 S.W. — In horse-trough, Hain worth, near Keighley. 



Mid W.— Add Bog (W. B. Turner). Near Selby. Bog two 

 miles south of Clapham. Penyghent. Ribblehead. 

 N.W.— Mickle Fell. 



N.E. —Strensall ! (W. B. Turner). Pilmoor, near Thirsk. 

 S.E. — Riccall Common. 



524. Sphaerozosma granulatum Roy & Biss. 

 N.E. — Pilmoor, near Thirsk. 



S.E. — Riccall Common. 



Genus DESMIDIU.M Aj;., 1824. 



525. Desmidium cyiindricum Grev. 



[Syn. Didyinoprium Grevilki Kiitz.]. 

 Mid \\-.— Adel Bog (W. B. Turner). 

 N.E. —Strensall (W. B. Turner). 



526. Desmidium Swartzii Ag. 



Mid W. — Bramhope (J. Abbott). Ilkley. Cocket Moss, near 

 Giggleswick. 



N.E.— Strensall I i^W B. Turner). Pilmoor, near Thirsk. 



527. Desmidium aptogonum Brdb. 



N.E. — Strensall ! (W. B. Turner). Pilmoor, near Thirsk. 



Var. Ehrenbergii l^\Ai.\^'jv\.Aptogonuin diagoiinmDiA^^. 

 X.E. — Strensall Common. 



^'ar. acutius Nordst. 

 N.E. — Pilmoor, near Thirsk. 



Trail-. Y.N.C., 1899 (pub. July 1901). Bbl. Series, Vol. 5. 



