54 THiRSK NATURAL HISTORY SOCIETY. [February, 



By way of illustrating the more direct influence which the 

 constitution of the rocks exercises, I will give another list of 

 species that are almost exclusively restricted to the calcareous 

 moorlands : — 



Seligeria pusilla. Tortula tortuosa. Hypnum lutescens. 



Trichostomum flexicaule. Encalypta streptocarpa. Hypnum chrysophyllum. 



Tortilla rigida. Bartramia (Ederi. Hypnum tenellum. 



Tortula ambigua. Anomodon viticulosus. Hypnum delicatulum. 



Tortula aloides. Cylindrothec. Montagnei. Neckera crispa. 



The great bulk of species not included in either of these lists 

 is pretty generally diffused throughout the entire district. 



Thirsk, North Yorkshire. 



THIESK NATURAL HISTOEY SOCIETY. 

 Botanical Exchange Club. 



The monthly meeting of the Thirsk Natural History Society 

 was held on the evening of Wednesday, the 5th of January. The 

 Rev. A. M. Norman, of Sedgefield, South Durham, was elected 

 a member of the Botanical Exchange Club. 



Mr. J. G, Baker announced the receipt of parcels from Messrs. 

 Barton, Brown, Hardy, Hunt, Ingle, Payne, Purchas, Richard- 

 son, and Windsor, and communicated the following notices, ex- 

 hibiting specimens of the species to which he made reference : — 



" Galium debile, Desv. Obs. PI. Ang. p. 134; G. const?'ictum, 

 Chauv. Fl. Agen. p. 67. — I have known for some time as an in- 

 habitant of the Thirsk neighbourhood, and passed over as uligi- 

 nosum, a Galium which appears, upon closer examination and 

 more rigid comparison with specimens, to be identical with G. 

 debile of Desvaux, a plant which has been known for the last 

 forty years in some of the western departments of France. In 

 its subprocumbent, interlaced habit of growth, it closely resem- 

 bles the true uliginosum, but the stem is stronger and smoother 

 than in that species, the flowers fewer, the pedicels shorter, and 

 the lower branches of the panicle much more elongated. Both 

 by Grenier and Lloyd it is compared with Asperula cynanchica 

 as regards general appearance, but of course it is larger in size. 

 In uliginosum the leaves are flat in surface and linear-lanceolate 

 in shape, whilst in debile they ate truly linear, and in the mature 



