MOSSES AND HEPATICiE OF JETHOU. 209 



From this it would appear that, in proportion to its size, 

 and notwithstanding the want of sandy ground, Jethou is the 

 richer island of the two, from a bryological standpoint. But 

 one thing is veiy clear. However close together two islets 

 may be, and however much they may resemble each other in 

 general aspect, their floras may yet, for some unexplained 

 reason, differ very considerably ; and therefore each islet 

 within our area should be studied carefully and independently, 

 exactly as if it stood quite alone. The difference between 

 Herm and Jethou is very striking, and perhaps I may add, 

 somewhat surprising, not only in their moss-floras, as already 

 explained, but also in their Flowering Plants, for Jethou 

 possesses more than a dozen indigenous species which do not 

 occur in Herm. 



I wish time and tide had permitted me to cross over to 

 Crevichon, the detached islet lying to the north of Jethou, 

 for very likely some interesting mosses are to be found there. 

 Although only a "conical rocky mound," as Professor 

 Babington described it, it is rich in vegetation, and ferns are 

 more plentiful there than in the main island of Jethou. 



When the forthcoming Census Catalogues of British 

 Mosses and British Hepatics are published we shall be able 

 to tell at a glance the comparative rarity or frequency through- 

 out the United Kingdom of any given species. I am pleased 

 to be able to re]3ort that as the result of some correspondence, 

 the compilers of tlie Catalogues have decided to include the 

 Channel Islands in the record, distinguishing them from 

 Britain proper by the letter " C." in the same way as in the 

 London Catalogue of Fhjwering Plants. The Moss Catalogue 

 will be issued in the course of a few months, and it will then 

 be seen that in the matter of Mosses, as well as in all the 

 other large divisions of our indigenous flora, we possess many 

 rarities of which we have good reason to be proud. 



MOSSES. 



Catharinea undulata, W. ^- M. Shady banks under the trees by the 

 houses. 



Polytriehum nanum, ^edc. Western side of the island. 



P. aloides, Hedw. Banks under the trees by tlie houses. 



P. juniperinum, WUU. Common, 



Apehidium alternifolium, Schp. Cliif path near Fauconniere. 



Pleuridium SUbulatum, Itah. In several places on the west side, and on 

 the cliffs near Fauconniere. 



CeratOdon purpureUS, Brid. Common. 



Dieranella heteromalla, ^Sclq). .Shady banks near the houses. 



Dieranum seoparium, Hedu-. Not uncommon all over the cliffs ; plenti- 

 ful on the north side. 



