D1xon: NEw MossEs FROM MALAY PENINSULA 253 
circa dimidiam latitudinem luminis aequantibus; superne dorso 
saepius rugulosae, vel humiliter papillosae. 
Cetera nulla. 
HAB. Fraser Hill, Pahang, alt. 4000-4370 ft., 1922; Burkill 
& Holttum (8715a). 
Growing densely interwoven with close masses of A. secundum 
var. angustifolium Fleisch., Trichosteleum hamatum and 
Boschii, so that it is very difficult to separate it or to judge of 
the actual habit of growth. It is however very distinct from alt 
the allied species in the glistening white colour, and the denti- 
culate margins. The toothing being very delicate and the mar- 
gins usually strongly incurved, this may easily be overlooked, 
but on careful examination it will be seen to be almost constantly 
present, and frequently at the leaf apex very pronounced. The 
rugosity of the leaves also is unusual in the wider leaved species. 
he cuspidate leaf-points are usually straight, but quite 
frequently hooked slightly, as in A. hamulatum. 
Acroporium aciphyllum Dixon sp. nov. (PLATE 4, FIG. 9). 
E majoribus generis, habitu A. falcifolii Fleisch. sed multo 
robustius, caespites altos, extensos, laxiusculos formans; caules 
8 cm. longi vel supra, parce ramosi, apice brevicuspidati, falcatt. 
Folia magna, 3-4 mm. longa, valde falcato-secundo; e basi late 
ovato-oblonga parum concava sat cito in subulam subaequilongam 
inferne convolutam superne piliformem substriciam contracta; 
integerrima, dorso laevia. Cellulae perincrassatae, parietibus 
porosis quam lumine multo latioribus, unde pori valde conspicut, 
elongati, parent; alares magnae, vesiculosae, sat angustae, elonga- 
tae. 
Dioicum videtur. Flores feminei solum visi, apices versus 
ramorum siti; perichaetii bracteae erectae, arcte adpressae, e 
basi late convoluta superne denticulata in subulam piliformem 
rectam argute denticulatam contractae. Seta circa 2 cm. alta, 
inferne laevis, apice leniter rugulosa. Theca pendula, angusta. 
HA Gunong Tahan, Pahang, 1911; Ridley (1017, 1029). 
Ibidem (1037), f. foliis patentibus, haud falcatis. 
This fine species differs from all the known Malaysian species 
with broad leaf bases at once in the long, fine, often piliform 
subula. A. sigmatodontium is perhaps the nearest species, but 
has leaves much narrower below, less finely acuminate, with 
very different perichaetial leaves. 
