130 Guide to Bcljast. 



In Dixon's Handbook of British Mosses and the Moss 

 Exchange Club Catalogue of Hepaticce, the latest sum- 

 maries of the British species, the Mosses number 600 species, 

 HepaticiC 220. Our district therefore contains considerably 

 more than half the British Moss flora and almost half the 

 British HepaticcT. Compared with the number of species 

 for Ireland in Moore's lists (369 Mosses and 137 Hepatics — 

 numbers however which have been augmented since 1S72), 

 the proportion is large. 



Little has been done as yet to arrange these plants into 

 groups according to their geographical distribution. It 

 probably depends in their case to a greater degree on suitable 

 habitats, shelter from sun and wind, and especially moisture, 

 than on latitude or longitude, as in the case of the flowering 

 plants. 



While we have no special Lusitanian group of species, the 

 following rare Western species form a link in this district 

 between those of Kerry on the one hand, and the western 

 coasts of Great Britain on the other, where they occur — 

 Wales, the English Lake District, and the north-west coast 

 of Scotland (where many species have lately been found 

 which were supposed to be peculiar to south-west Ireland) : 

 Ulota calvescens, Hpynu7n eugyrium, Jubula HutchinsicB, 

 Lejeunea 7nicroscopica and L. ovata, Radiila aquilegia, 

 Adetanthus decipiens, and Plagiochila interriipta var. 

 pyrenaica. 



Two interesting southern Mosses find their northern limit 

 here — Webera Tozeri at Derriaghy, Co. Down, and Ilypmcm 

 illecebrutn at Sallagh Braes, Co. Antrim. There do not 

 appear to be any American species. The following British 

 genera and species are not represented : Timmia, CEdi- 

 poditini, Grimmia cofunnitata, Barbula liirida^ Leskea 

 polyantJia, Orthothecitwi, Hypiiinn tiifens, H. ccespitosufti, 

 H. megapolitanum, H. circinatum, H. striatutiivi, and H. 

 utnbratuin; while Encalypta vulgaris is very rare, having been 

 only found at Cave Hill and Lurigethan (but not recently), 

 and Aulacomnium androgvfium, reported many years ago 

 from Manyburn. 



The alpine mosses are not numerous or remarkable. 

 Several, such as Andrecea and £ry2itn a/pinum, are found 



