158 BRITISH MOSSES. 



" It is my intention, as soon as sufficient material can be accumulated, 

 to publish l A Geographical Distribution of the British Mosses,' 

 and in furtherance of this object I should esteem it a great favour 

 if all collectors throughout the kingdom would kindly be at the 

 trouble of forwarding to me, as early as convenient, complete lists 

 of the mosses found by themselves or their friends, in their several 

 districts, with any notes they may think desirable respecting them, 

 and, where possible, the range and habitat of the various species. 

 I feel sure I have only to mention this to ensure an abundant re- 

 turn of information for a work which is really wanted, and shall, 

 as far as any exertions on my part can ensure it, be really valuable." 



This information should be forwarded to C. P. Hobkirk, Esq., 

 Arthur Street, Huddersfield. 



LICHENS OP SOWERBY'S HERBARIUM. 

 By Rev. J. M. Crombie, M.A.* 



No. II. Parmelia — Gyrophora. 



1. Lichen perforatus. E.B. t., 2423. = Parmelia perforata, var. 

 ciliata, D.C. The middle fig. with the perforated apothecia being 

 from an exotic specimen. The true Parmelia perforata (Wulf) = 

 P. reticulata, Tayl., is distinguished by its minutely reticulato- 

 rimose thallus, of which the medulla gives reaction with K +, yel- 

 low, and then red. It is very rare in Britain, though a specimen 

 with young apothecia from Dunkerron, Ireland, occurs in herb. 

 Brit. Mus. 



2. Lichen physodes. E. B.t., 126. = Parmelia physodes and its 

 var. labrosa, Ach. The fig. is a composite one, made up of 

 the type and this variety, which latter is more distinctly delineated 

 in fig. 5. Fig. 3= var. recurva, Leight. Lich. Fl. p. 126, which 

 is a condition of var. labrosa. The var. vittata, Ach., though not 

 drawn, also occurs in herb. Sowerby, and is referred to in the des- 

 cription. 



3. Lichen incurvus. E. B. t., 1375.= Parmelia Mougeotii (ScliEer.) 

 The specimen drawn, is not true P. incurva (Pers.), as certain ex- 

 pressions in the description would lead us to suppose, but a very 

 characteristic specimen of the larger form of P. Mougeotii, con- 

 necting it with P. conspersa. True P. incurva = Lichen multifidus, 

 Dicks., Crypt, in., p. 16, t. 9,/ 7, is not unfrequent, though with 

 the apothecia not very well developed on the mountains of Braemar, 

 where also/, discreta, Nyl. pro p. occurs, but infertile. 



4. Lichen encaustus. E. B. t., 2049. =Parmelia alpicola^h. Frs. 

 The colouring of the fig. and the language of the description — 

 " This dirty ill-looking Scotch plant, both point to P. alpicola as 

 the species denoted, which is confirmed by the specimen in herb. 



* Condensed from " Journal of Botany," Dec., 1872. 



