I02 YORKSHIRE NATURALISTS UNION. 



476. Staurastrum pygmaeum Breb. 



S.W. — Cullingworth. Near Keighley. Ogden Clough. Swill 

 Hill. Near Hainworth ! (T. Hebden). 



Mid W. — Markington ! (Rev. J. S. Tute). Ingleborougn. 

 Penyghent. Near Buckden. 



N.W. — Cautley Spout (with zygospores). Cronkley Fell. 

 Great Shunnor Fell. 



N.E. — Strensall. Pilmoor, near Thir.sk. 



Zygospore globose, mamillate; each conical elevation furnished 

 with a long s]:)ine ; apices of spines twice furcate (subdicho- 

 tomous). Diameter of zygospore without spines 36-39//, 

 with spines 64-67 jm. 



We have had zygospores of this species from Leca in Portugal 

 (cfr. 'Alg. Aq. Dulc. Lusitan ,' Notarisia, vol. vii., 1892, p. 1503) 

 and they agreed exactly with those from Yorkshire. We must, 

 therefore, consider the zygospore figured in Ralfs' Brit, l^esm. 

 t. XXXV., f. 26 r as immature with regard to its spines. 



The specimens obtained from Cautley Spout (with zygospores) 

 were rather more depressed than usual and the lines of granu- 

 lation were a little further apart. 



477. Staurastrum Kjellmanii Wille. 

 N.W.— Mickle Fell. 



Var. rotundum ^^'est & G. S. West. 

 S.W. — Ogden Clough. 

 Length 43 // ; breadth 25-26-5 /x; breadth of isthmus 13-5 /'. 



478. Staurastrum turgescens DeNot. 

 S.W. — Crimsworth Dean. 



Var. arcticum Wille. 

 S.W. -Ogden Clough. 



479. Staurastrum muricatum Breb. 



S.W. — Ogden CJough. Near Wilsden. Nab Wood, near 

 Bingley. Keighley Moor. 



Mid W.— Adel Bog. Rombald's Moor. Bog two miles south 

 of Clapham. Near Buckden. Whernside. 



Trans. Y.N.U., 1899 (pub. July 1901). Hot. Series, Vol. 5. 



