84 YORKSHIRE naturalists' UNION. 



Length, 83-94 /x ; breadth, 62-67 F- i breadth of apex, about 

 19-25 [i; breadth of isthmus, i7'S-23 p-. 



Zygospore globose, furnished with few (about eleven in the 

 periphery) short, very thick spines ; apices of spines obtuse or 

 slightly emarginate. 



Diam. without spines 60 ft, with spines 76 fi ; length of spines 



6-7 '5 Z^- 



Var. subcirculare Wille, 1880. 

 Mid W.— Baildon. Boston Spa. 



Var. amcebum West, 1892. [Syn. C. ochthodes forma 

 granulosum Liitkem, 1893 ; C. ochthodes var. amotbo- 

 granulosum Schmidle, 1894; C. speciosum Lund. var. 

 australianum Nordst. forma Gutvv., 1891]. 

 N.W. — Mickle and Cronkley Fells. 



This variety is about the same size as the type, but the serai- 

 cells are more trapeziform, possessing broader apices. The 

 outline is but faintly undulate (much less undulate than in the 

 type), and the granules are very broad towards the centre of the 

 semi-cells, of almost inappreciable elevation and sinuous in out- 

 line (hence the name, var. amcebum). 



Length, 87-90 /.t; breadth, 60-67 V-\ breadth of apex, 25-27/*; 

 breadth of isthmus, 2 1 /a ; thickness, 40 /*. 



373. Cosmarium didymochondrum Nordst. 



Mid W. — Shipley Glen (iv. 1895), abundant on dripping 

 rocks. Ingleton (viii. 1899). 



374. Cosmarium subnotabile Wille. 



Mid W. — Near Settle (viii. 1896). Penyghent (iv. 1896). 

 N.W.— Cautley Spout (ix. 1899). 



375. Cosmarium Rostafinskii Gutw. 

 N.W. —Cautley Spout (ix. 1899). 



This species has not previously been recorded for the British 

 Isles. We have also seen it from Scotland. 



376. Cosmarium tumens Nordst. 



Mid W. — Ingleton, on dripping rocks (viii. 1899). 



Trans. Y.X.U., 1897 (pub. Dec. 1900). Bot. Series, Vol. 5. 



