42 YORICSMIRE naturalists' UNION, 



Mid W. — On stones in stream, near Giggleswick. 

 S.E.— East of Selby. 



162. Mesotsenium chlamydosporum DeBary. 



Mid W. — Above Eld wick. Black Hill, near Settle. Cowgill 

 Wold Moss, Widdale Fell. 



N.W. — Lund's Fell, at 2,000 feet. Cautley Spout. 

 Length, 25-32"S)li; breadth, 12/*. 



163. Mesotaenium caldariorum (Lagerh.) Hansg. 

 S.W. — Forming a green gelatinous stratum with Dactylothece 



Braunii, in greenhouse, Bradford (ix. i8g6). 



The figure given by Turner (in Kongl. Sv. Vet-Akad. Handl. 

 Bd. 25, no. 5, 1892, t. I, f. 23) does not at all represent the 

 species. There is an almost imperceptible constriction in the 

 middle of the cell, and the cells are somewhat suddenly attenu- 

 ated near the apices, which are rounded. 



It has not previously been recorded for the British Isles. 



164. Mesoteenium Endlicherianum Nag. 

 S.W. — Damp shady rocks near Bingley. 



Mid W. — Ingleton. Bowland Knotts. Penyghent. Old Cote 

 Moor. Cowgill Wold Moss, Widdale Fell. 



N.W.— Lund's Fell. 



Length, 25-27 /* ; breadth, 8-9 /i. 

 Var. grande Nordst. 



S.W. — Cragg Vale, towards Blackstone Edge. 



Mid W. — Cocket Moss, near Giggleswick. Black Hill, near 

 Settle. 



Length, 52 /* ; breadth, 12-5 /*. 



165. Mesotaenium purpureum West & G. S. West. 

 Cells free-swimming, cylindrical, and slightly curved, 3J to 4J 



times longer than the diameter, poles rounded; chromatophores 

 purple, not interrupted in the middle of the cells. - ' ' ' 



Length, 32-46 ju; breadth, 9'S-io /"■ 



Mid W. — Old Cote Moor, in peat bogs. 



Trans. Y.N.U., 1896 (pub. Sept. 1900). Bot. Series, Vol, 3, 



