165 
ADDITIONS TO THE LICHEN FLORA OF THE 
WEST RIDING OF YORKSHIRE. 
ABRAHAM SHACKLETON, ann THOMAS HEBDEN, 
Braithwaite, Keighley. Cullingworth, 
In the ‘ Flora of West Yorkshire’ by Mr. F. Arnold Lees it is stated 
that the sum total of West Yorkshire Lichens amounts to 258 
species, and, ‘compared with the known British species, the 
percentage of the whole is still far below that which the Mosses, 
Hepatics—and even the Fungi—show us,’ anid that ‘ West Yorkshire 
should, surely, nourish three hundred forms.’ 
Since the publication of that work we have conjointly worked at 
infrequent intervals, during short holiday excursions, a few of the 
more accessible districts of North West Yorkshire, chiefly in the 
upper. watersheds of the rivers Ribble, Aire, and Wharfe. 
We now offer this additional list, not as an exhaustive one, but 
as a contribution towards the whole. 
Those species found in a different drainage area to that 
mentioned in ‘ The Flora,’ appear for the sake of their geographical 
distribution, or if occurring upon a different substratum are also 
named. ; 
Doubtful. species have been referred to Dr. Nylander, of Paris, 
to whom we tender our sincere thanks for his kindness in examining 
such species. 
Forms new to West Yorkshire have an asterisk prefixed. 
Fam. I1.—COLLEMACEI. 
I. COLLEMEI. 
Coliema cheileum Ach. A. Cononley. Harden. 
*“Collema granuliferum Nyl. W. Bolton Abbey. 
*Collema polycarpon Scher. L. Clapham. A. Malham. 
WV. Grassington. 
Collema multipartitum Sm. L. Clapham. A. Malham, in 
fruit. 
Leptogium sinuatum Huds. W. Draughton ; the Strid. 
*Leptogium schraderi Bernh. A. Malham; Gordgle: Malham 
Tarn, on decaying limestone scars. 
June 1893. 
