88 YORKSHIRE NATURALISTS' UNION. 



Var. eboracense var. n. 



Smaller than the typical form ; semicells with fewer and more 

 prominent undulations ; membrane punctate. Length, 21 /j. ; 

 breadth, 14 [i; breadth of isthmus, 10 fj.; thickness, 12 /i. 



N.W.— Cautley Spout. 



This rare alpine species has not been previously recorded for 

 the British Isles. 



391. Costnarium conspersum Ralfs. 

 Mid W.— Malham Tarn. 



N.W.— Mickle Fell. Great Shunnor Fell. 



Var. rotundatum Wittr. 

 S.E. — Skipwith Common ; a form with the sides slightly 

 diverging. 



392. Cosmarium quadrum Lund. 

 S.W.— Cullingworth. 



393. Cosmarium latum Br^b. 

 N.W.— Mickle Fell. Great Shunnor Fell. 

 N.E. — Pilmoor, near Thirsk. Carlton Bank. 



Forma minor Boldt, 1888. 



[Syn. C. latum var. minor Roy & Biss., 1894]. 

 S.W.— Ogden Clough. 

 Mid W, — Boston Spa. 



394. Cosmarium biretum Brdb. 

 S.W. — Cullingworth. 



Mid W. — Roundhay Park, Leeds. 



Var. trigibberum Nordst. 

 Mid W. — Roundhay Park, Leeds. 



395. Cosmarium Broomei Thwaites. 

 S.W. — Cullingworth. 



Mid W.—Wigton Moor. Baildon. AdelBog. Moughton Fell. 

 N.W.— Mickle Fell. Great Shunnor Fell. 

 N.E. — Pilmoor, near Thirsk. 

 S.E. — Riccall Common. 



396. Cosmarium amoenum Br^b. 

 Mid W. — Cocket Moss, near Giggleswick. 



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



