242 Moss Flora of Hagg Wood, near Huddersfield. 



type of vegetation, and here the bilberry and the ling are much 

 in evidence, with a corresponding moss flora on a limited 

 scale. Almost in the centre of the wood there is a large quarry, 

 which, until (juite recently, had been long disused. In the 

 older workings the moss flora is fairly rich and varied, but 

 on the river-bank rock exposures the flora is disappointing, 

 due, I believe, to quickly changing local conditions. The 

 wall mosses vary in richness, probably owing to varying 

 conditions of environment, e.g., air currents and exposure. 

 Speaking generally, the walls which face north-east are 

 richest in mosses, but again, at one, part the north-east ex- 

 posure is almost devoid of mosses, whereas on the opposite 

 side of the road, the wall is almost covered with living green, 

 and there is, besides, a remarkable specific richness', that is, 

 judged by a local standard, so that one finds it difficult to 

 discover any governing law which is not liable to change in 

 accordance with local conditions. In the present instance, I 

 believe, the determining factor is the proximity of a large 

 number of half -grown pines. 



In the naming and arrangement of species I have followed 

 ' The Students' Handbook of British Mosses,' by Dixon and 

 Jameson. 



The study has been of great personal interest, but unfor- 

 tunately 1 have had to abandon the work on leaving the 

 district. The results, therefore, are incomplete. 



Specimens, mounted on cards, and also loose for examina- 

 tion, have been placed in the Tolson Memorial Museum, 

 Huddersfield, along with full details of habitats. 



I have to thank warmly Mr. W. H. Burrell, and Mr. 

 Chris. A. Cheetham for their kind help in the work of identi- 

 fication. To Dr. T. W. Woodhead my thanks are due for his 

 suggestive helpfulness, and his encouragement, especially 

 during the early and difficult days. 



Hagg Wood Mosses. 



Sphagnum subsecundum var. B. contortum Schp. Pond side, semi-sub- 

 merged . 

 Tetraphis pellucida Hedw. Distribution general, e.xposed tree-roots, 



tree stumps, and on the ground near the foot of trees. 

 Catharinea undulata Web. and Mohr. Distribution general, damp, shady 



ground . 

 Polytrichiim aloides Hedw. Not common, damp clay in shady situations ; 



rock fissures. 

 P. urnigerum L. Not common, damp and shady situations, fiat rocks. 

 P. formosum Hedw. Not uncommon, but never typical growth ; damp 



clay. 

 P. commune L. Not common, cinder path. 

 Ceratodon purpttreus Brid. Very common, lime on walls, on the ground, 



tree stumps, etc., etc. ; generally in fruit, and abundant. 

 Dicranella heteromalla Schp. Distribution general, damp clay, on rocks ; 



a good fruiter. 



Naturalist 



