Dixon: NEw MosseEs FROM MALAY PENINSULA = 255 
the form of Acroporium with the papillae of Trichosteleum, e. 
g., IT. Boschit. 
The seta also is shorter than in A. secundum, and the peri- 
chaetial leaves, though similar, are not identical, having a straigh- 
ter and longer, more gradually tapering subula. 
The leaves in this genus, at least in the Section Eu-acroporium, 
fall into two groups as regards outline. In most of the larger 
species the general outline is oval, with a more or less cuspidate, 
semi-convolute tip, which however bears a very small proportion 
in length to that of the whole leaf. In the other group, mostly 
of the smaller species, but including A. secundum.-of the larger 
ones, the outline of the leaf is narrow throughout, and the 
leaves frequently taper almost from the base, often being more 
or less convolute throughout, or at any rate tubular and subulate 
for a great proportion of their length. The present plant, with 
A. falcifolium Fleisch. and A. aciphyllum described above, 
holds a somewhat intermediate position, the two latter, how- 
ever, belonging rather to the first group, while the present plant 
is clearly of the second. 
The Pahang and Selangor plants were named and distributed 
as Sematophyllum perpapillosum Dixon sp. nov. before I saw 
Brotherus’ species. 
Acroporium albidissimum Dixon sp. nov. (PLATE 4, FIG. 13) 
A. longicuspidi Broth. ante descripto affine; differt colore 
pulchre albido, nitido, foliis multo brevioribus, latioribus, oblongis, 
breviter, stricte, subobtuse, tubuloso-acuminatis; areolatio et 
papillae similes; rami quoque nonnulli dimorphi foliis multo 
angustioribus, subcylindricis, laevibus vel sublaevibus inveni- 
untur. 
Planta sterilis solum nota. 
HAB. Among PTaaae spiniforme, Gunong Tahan, 
Pahang, 1911; Ridley (10 
The highly papillose cells are identical in this and the last 
‘species, and apart from any possible fruiting characters the 
difference lies entirely in the white colour, and the much broader 
and shortly pointed leaves. The dimorphism of the Leen ae il is 
quite as clearly marked here. 
