208 WILLIAMS: THE GENUS DESMATODON 
differentiated. Cells of upper part of leaf mostly quadrate to 
hexagonal, scarcely or not elongate, obscure, densely papillose on 
both sides or distinct and more or less mamillose; those of lower 
part of leaf, pale, smooth and elongate-hexagonal to rectangular. 
Perichaetial leaves usually not greatly differentiated. Seta erect, 
often strongly twisted. Capsule oblong to cylindric, erect or 
nodding and curved, with stomata mostly few, in the basal part, 
the columella often projecting above the rim; the lid conic to more 
or less beaked. Annulus compound, often persistent. Peristome 
densely papillose, the sixteen teeth (sometimes scarcely devel- 
oped in D. obtusifolius) from a basilar membrane usually ex- 
tending well above the annulus, mostly divided to near the base 
into two or three slender, erect or oblique forks, or the forks some- 
times quite irregular and more or less united above. Calyptra 
cucullate, descending well below the lid. 
Type species: Dicranum latifolium Hedw. 
Capsule erect and symmetric or — so; leaf margin of one 
thickness of cells. 
Cells of upper part of leaf more or less densely papillose 
with variously shaped papillae 
Leaf-margins somewhat wea % d leaves hair- 
pointed (except in D. Babies muticus which 
is distinguished from D. obtusifolius by the 
leaves with margins partly flat and twice as 
long, 2.5-3 mm., and by the spores, 20 uw in- 
tead of 8-10 yu); the older leaves without a 
distinct golden-brown border 
Monoicous. 
Upper ea with blade usually 2-3 mm. 
ong. 
fe or less spatulate or oe the 
upper marginal cells m obscure 
and rough with numerous selec 
Gradually tapering from below the mid- 
v 
. latifolius. 
e to an acute point. 2. D. sucerectus. 
Upper leaves with blade I.5 mm. + OF less, 
long, the upper het cells distinct 
with few or no papi 3. D. Guepini. 
Dioicous; blade of leaf shee 2.5 mm. long. 4. D. plinthobius. 
Leaf-margins sagead strongly*revolute all round and . 
leaves not hair pointed. 5. D. obtusifolius. 
Leaf-margins pag a older leaves with a distinct, 
golden-brown er. 6. D. Porteri. 
Cells of upper part of ‘ei never a distinct, mostly 
amillose on one or both si 
Median leaf-cells 15-20 u en spores ‘tibet 254% in 
diamet 7. D. systilius. 
