W. West and G. s. West : alga-florA of Yorkshire. 4.1 



Mid VV. — Cowgill Wold Moss, Widdale Fell, in peaty pools 

 amongst Sphagnum cuspidatum var. plumosum. 



The cells were solitary or in pairs (after division), and occurred 

 somewhat sparingly among a large quantity of Arthrodesmus 

 Incus. It was very difficult to determine the precise nature of 

 the spiral, because of its irregularity and the small size of the 

 plant; it only made from half to three-quarters of a turn, and the 

 protoplasm (outside the spiral) contained some large granules. 



156. Spirotsenia obscura Ralfs. 

 N.E. — Terrington, abundant (vi. 1898). 



157. Spirotaenia acuta Hilse. 

 N.E. — Pilmoor, near Thirsk. 



158. Spirotaenia tenerrima Arch. 

 N.E. — Pilmoor, near Thirsk. 



Genus MESOT^NIUM Nag., 1849. 



159. Mesotaeniutn DeGreyii Turn. 



Mid W. — Blubberhouses (VV. B. Turner). Ilkley. Simon Seat. 

 Black Hill, near Settle. 



160. Mesotsenium mirificum Arch. 



S.W. — Ogden Clough, forming gelatinous masses on dripping 

 shale rocks. Length, 25-36 /a; breadth, is-i8/x. 

 Mid W. — Ingleton. 



161. Mesotsenium macrococcum (Kiitz.). [Syn. Palmo- 

 gloea macrococcum Kiitz., 1845; Mesotieninm Braunii 

 DeBary, 1858]. 



S.W.— Hebden Bridge. 



Mid W. — Not unfrequent among wet mosses in narrow glens. 

 Adel Bog (W. B. Turner). Above Eldwick. On stones in stream 

 near Giggleswick ; also among wet mosses near Giggleswick. 

 Linn Ghyll. 



N.W.— Sedbergh. 



Var. microcOCCum (Kiitz.) Kirchn. [Syn. Palmoglcea 

 micrococca Kiitz. ; Mesotctnium Braunii var, minus 

 De Bary], 



