W. WEST AND G. S. WEST: ALGA-FI.ORA OF YORKSHIRE. I03 



N.W.— Mickle and Croiikley Fells. Great Shunnor Fell. 

 Bog near Widdale Beck. Muker. Cowgill Wold Moss, Wid- 

 dale Fell. 



N.E. — Carlton Bank. Stokesley. Near Scarborough. 



480. Staurastrum pyramidatum West. [Syn. 5. muri- 

 cafiiin Bxih. var. West in Journ. Bot., Oct., 1889; 

 5'. miiricatum var. acutuin West]. 



Mid W. — Cocket Moss, near Giggleswick. Penyghent. 



N.W.— Cautley Spout. Mickle and Cronkley Fells. 



48 r. Staurastrum Arnellii Boldt. 



N.W.— Mossdale Moor, Widdale Fell. 



This rare species was described by Boldt in Ofvers. af. K. 

 Vet.-Akad. Forh. 1885, no. 2, p. 112, t. v., f. 21. Roy describes 

 a variety of it as extremely rare in Scotland, but the typical 

 plant has only previously been recorded for Siberia. ^Ve have 

 recently obtained it in abundance from Y Foel Fras, N. Wales. 



Length 36 '5-38 'S ju,; breadth 34-5-37 /t; breadth of isthmus 

 9-12-5 ;«,. 



482. Staurastrum spongiosum Br^b. 

 N.W.— Mickle Fell. 



483. Staurastrum Meriani Reinsch., 1867 



[Syn. S. hexagonutn Racib., 1885]. 

 Mid W. — Blubberhouses (W, B. Turner). Baildon. Ingleton. 

 Penyghent. 



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



484. Staurastrum tumidum Breb. 

 Mid W.— Ilkley (W. H. Dikes). 



485. Staurastrum Cosmarioides Nordst. 

 Mid W. — Blubberhouses (W. B. Turner). 



486. Staurastrum brachiatum Ralfs. 

 N.W.— Mickle Fell. 



N.E.— Pilmoor, near Thirsk. 

 S.E.— Riccall Common. 



