BOTANICAL REPORT 1877. f 



lichens, if well worked out, would probably yield results of great 

 value to geographical botany. 



Of Mosses a fair number has been obtained at each of our 

 excursions; the total number of species observed is 84 out of the 

 568 known to be British. Two of the species, Didyinodon 

 sinuosus, Wils., found at Collingham, and Didymodoti luridus, 

 Hornsch, found at Sharleston, had not before been found in 

 Yorkshire. 



Hepaticae. The plants of this order prefer the hilly and rainy 

 western parts of our island, and as might be expected, a larger 

 number of them were found at Shipley and Copley than at any 

 other of our meetings. Thirteen out of 136 British species have 

 been found, all of them such as are common in places where the 

 conditions favourable to their existence are met with. 



Lichens. The smoke-blackened tree-trunks and stones of 

 the manufacturing districts of the West Riding are not favourable 

 to the growth of these plants. Only 22 out of the 568 British 

 species enumerated by Crombie have been met with. Of these 

 the common Peltigera canma is the only one not recorded for 

 Yorkshire in Leighton's Lichen Flora, and this species must 

 no doubt have been frequently observed before. 



Algae. The fresh-water Alg^ are very generally neglected 

 by our field botanists, doubtless in great part owing to there 

 being no recent or accessible hand-book on the order. In- 

 teresting however as the Confervoid Algse are to the morphologi- 

 cal and physiological botanist, they promise less aid to 

 geographical botany than do the foregoing orders, since many of 

 them are ubiquitous in their distribution and their occurrence is 

 determined rather by the presence of a suitable medium than by 

 geographical situation. Thirteen species have been found at our 

 meetings, and as no systematic list of Yorkshire Algje has ever 

 been published it will be worth while recording their names, 

 although most of them are common species. 



Lemania fluviatilis, Ag. ... .... Shipley Glen 



Draparnaldia plumosa, Ag. ... VVetherby 



Cladophora glomerata, Z... ... Shipley Glen 



