1857.] RARE OR SCARCE MOSSES. 179 



of rivulets^ on roots, stumps, and on the earth itself where occa- 

 sional floods bring down and deposit upon them a fine mud ; it 

 appears to shun the light. 



Dicranum longifolium, Maiden Bower Crag, Dumfries (Mr. 

 Wilson), intermixed with Grimmia patens, out of which I have 

 picked a few stems, without any doubt belonging to this long 

 doubtful British species. 



Dicranum {Thysanomitrium) uncinatum, Harvey. D. circina- 

 tum, Wils. Bryol. Brit. p. 76. — This species will probably be 

 found to be much less rare than supposed ; it has been gathered, 

 intermixed with Jungermannia Doniana in Clova, by Dr. ■?. D. 

 Hooker ; it was also gathered in Switzerland by Sir W. Hooker ; 

 and I have seen it intermixed with a specimen of Jungermannia 

 Doniana sent by Mr. Croall to Mr. A. O. Black. 



The fructification, not yet observed in Europe, is that of a 

 Campylopus, and might be readily passed over except by an ex- 

 perienced eye. 



Hypnum Berthelotianum, Mont. Hist. d. Isles Canaries, t. i, 

 f. 2. Leucodon Lagurus, Bryol. Brit. — I have but little doubt 

 of the above being the name this pretty Moss should bear : ex- 

 actly similar specimens were collected in the Azores and kindly 

 given to me by Mr. H. C. Watson. They were accompanied by 

 some stems with more serrated leaves, corresponding with an au- 

 thentic specimen from Dr. Montague himself. I do not think 

 it very like Leucodon Lagurus. The occurrence of this Azoric 

 species so far north prompts the query. Why should Ave not find 

 some other species which are at least as likely to be found here 

 as H. Berthelotianum? Of these one is Hypnum spinosum, Mitten, 

 MSS., a Moss so very closely resembling H. hispidum, Hook, 

 fil. et Wils. Crypt. Antarct. t. 61. f. 2, that for some time I 

 thought them identical. It has stems three or four inches high, 

 dark or obscure, yellowish-green, simple or pinnately branched, 

 its erecto-patent leaves very rigid, gradually attenuated from an 

 ovate base, the nerve percurrent, scarcely altered in drying, giv- 

 ing the plants a peculiar rigid spinous appearance ; it would pro- 

 bably occur on stones or on roots by the sides, or in, rivulets. 

 I hope shortly to be in a position to give a full description of 

 this Moss, having as yet seen only the base of a seta on speci- 

 mens found in Madeira by Mr. Johnson. 



Trichostomum, flavo-virens, Bruch, Bryol. Europ. Trichosto- 



