W. WEST AND G. S. WEST ; ALGA-FLORA OF YORKSHIRE. 85 



Length, 49-5 i/x; breadth, 30-33 /* ; breadth of isthmus, 

 17-19/i; thickness, 27 /*. 



This rare species has not previously been recorded for the 

 British Isles. It is known from Spitzbergen, Bohemia, and the 

 United States. 



377. Cosmarium speciosum Lund. 



S.W. — Ogden Clough. Crimsworth Dean. Keighley Tarn. 

 Mid W. — Shipley Glen. Holden Ghyll, near Keighley. Near 

 Ilkley. Cowside Beck, Arncliffe. Penyghent. 



N.W.— Mickle Fell. Lund's Fell. Cautley Spout. 



Var. biforme Nordst. 

 Mid W. — Arncliffe, abundant. 



Var. simplex Nordst. 

 Mid W. — Penyghent. 

 N.W.— Mickle Fell. Cowgill Wold Moss, Widdale Fell. 



forma intermedia Wille. 



S.W.— Woolley. 



This species and its varieties are not unfrequent on wet rocks 

 amongst C. Holmiense, C. amceps, Penium cuciirbitinum, etc. 



378. Cosmarium subspeciosum Nordst. 

 Mid W. — Shipley Glen. Penyghent. 

 N.W.— Mickle Fell. 



N.E. — Scarborough Mere. 



379. Cosmarium speciosissimum Schmidle. 

 N.W.— Mickle Fell. 



This alpine species was described by Schmidle in Oesterr. 

 Botan. Zeitschrift, Jahrg. 1895, p. 24 (Sep.), t. xv., f. 30, 31. 

 It is more profoundly crenate than C. speciosum or C. subspecio- 

 sum and the crenations are slightly emarginate ; moreover, the 

 row of marks across the base of the semi-cells is distinctive. 



Length, 55 /* ; breadth, 36 '5 /u; breadth of isthmus, i7'S /* ; 

 thickness, 24/1. 



It has not previously been recorded for the British Isles. 



380. Cosmarium hexalobum Nordst. 

 N.W.— Mickle Fell. 



Pot. 5— F 



