^'■1S<^. 



42 



YORKSHIRE NATURALISTS UNION. 



Mid W. — On stones in stream, near Giggles wick. 



F 



S.E.^East of Selby. 



162. Mesotsenium chlamydosporum DeBary. 



Mid W. — Above Eldwick. Black Hill, near Settle. Cowgill 

 Wold Moss, Widdale Fell. 



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

 Length, 25-32'5//; breadth, 12//.. 



163. Mesotsenium caldariorum (Lagerh.) Hansg. 



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

 Braunii, in greenhouse, Bradford (ix. 1896). 



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. Mesotsenium 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 /x. 



Van grande Nordst. 



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



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



Settle. 



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



165. Mesotsenium purpureum West & G. S. West. 



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

 times longer than the diameter, poles rounded; chromatophores 

 purple, not interrupted in the middle of the cells. 



Length, 32-46 fi ; breadth, 9*5-10 /a. 



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



i 



I 



Trans. V.N.U., 1896 (pub. Sept. 1500). 15ot. Series, Vol. 5. 



J 



