FROM THE CAMEROONS MOUNTAIN AND RIVER NIGER. 149 
fusco tomentoso parce ramoso, foliis erecto-patentibus e basi latiore 
sensim longe angustatis, marginibus integerrimis incurvis, nervo basi 
$ superne totam folii latitudinis occupante, cellulis alaribus pallide fus- 
cis, inde ad latera angustis hyalinis, interioribus latioribus sensim su- 
perne in minutas oblongas rotundatasque transeuntibus, perichetialibus 
externis e basi ovata latiore internis e basi oblonga convoluta subulatis, 
theca in pedunculo cygneo flexu ovali zquali plicata, operculo subu- 
lato rostrato, peristomio dentibus rubris dicranis, annulo composito, 
calyptra basi fimbriata. 
Hab. Cameroons Mountain, alt. 9000 feet, Mann. 
Closely allied to D. nivale, Brid., but seems to differ in the less rigid 
foliage and more evident lamina of the leaf at the base. The stems are 
from two to three inches in height, and the foliage yellowish green and 
straw-coloured. 
D. DIVARICATUM, sp. nov. Laxe cespitosum, caule erecto ramoso 
radicellis rubris tomentoso, foliis divaricatis lanceolato-subulatis apice 
serrulatis, nervo lato tertiam partem folii latititudinis occupante fere 
ad apicem a pagina discreto percurrente, cellulis alaribus numerosis 
a reliquis distinctis fuscis, basi ad nervum paucis oblongis ad margines 
brevibus quadratis, inde ad apicem parvis rotundatis. 
Hab. Prince’s Island, Barter. 
Remarkable for its divaricate leaves, which when dry are incurved ; it 
approaches D. arenicolum, C. Müller. 
D. NIVALE, Brid. 
Hab. Cameroons Mountain, alt. 9000—10,000 feet, on rocks, Mann. 
D. ERICETORUM, Mitten. 
Hab. Cameroons Mountain, alt. 7000-10,000 feet, on rocks, Mann. 
These specimens are fertile; in the barren state the species is found in 
the warmer parts of Europe and the Atlantic Islands, but always without 
fruit. 
Dipymopon, Hook. 
D. RADICOsUS, sp. nov.  Caule elongato, foliis e basi erectiuscula 
latiore recurvis squarrosis subsecundis lanceolatis nervo excurrente 
carinatis complicatisque, marginibus ad medium reflexis inde ad apicem 
serratis, cellulis basi elongatis pellucidis ad angulos brevibus quadratis 
superioribus rotundatis omnibus distinctis vix papillosis, perichactiali- 
bus exsertis longe convolutis, theca in pedunculo luteo flexuoso cylin- 
dracea pallida ore rubro, operculo subulato longirostro, peristomio 
dentibus angustis brevibus. 
Hab. Cameroons Mountain, alt. 8000 feet, Mann. 
Larger than its near allies, D. squarrosus, Hook., D. sulphureus and 
D. aggregatus, C. Müller. Leaves scarcely papillose, and cells every- 
where with distinct pellucid interstices. Several rows of cells break up 
at the mouth of the capsule to form the annulus. 
