254 Dixon: NEw MossEs FROM MALAY PENINSULA 
No. 1037 has the leaves quite straight, and may possibly be 
the type form, but only a stem or two were seen of this, while 
the falcate-leaved plant is present in considerable quantity, and 
must be presumed to be the prevailing form. 
A. piliferum Broth. from the Philippines has much wider 
leaves, more rapidly, often quite abruptly piliferous. 
Acroporium longicuspis (Broth.) Dixon sp. nov. (PLATE 4, 
FIG. 
Sematophyllum longicuspis Broth. MS. in sched. 
Habitu staturaque S. secundi var. angustifolii Fleisch., sed 
folia parum secunda, undique patentia. Folia breviuscula, circa 
2 mm. longa, e basi subconvoluta ovato-lanceolata, stricte subulato- 
tubulosa, integerrima; cellulae majusculae, valde incrassatae, 
lumine parietem porosam latitudine subaequante, dorso plerum- 
que mamillose undulato-rugosae, saepius quoque papilla unica 
media alta grosse scabrae. 
Dioicum videtur. Perichaetium sat parvum, bracteis erectis 
e basi late ovata in acumen subpiliforme vel loriforme subaequt- 
longum argute denticulatum angustatis. Seta 1.5 cm., laevis vel 
apice paullo rugulosa. Theca parva, pendula. 
AB. Taiping, Perak, 1909; Ridley (200). Fraser Hill, 
Pahang, 4000-4370 ft., 1922; Burkill & Holttum (8711)... Bukit 
Hitam, Selangor, 1896; Ridley (391). 
Somewhat resembling the narrow-leaved forms of A. secun- 
dum this species differs in the short leaves not twisted and rarely 
secund; in the more incrassate cells, and especially in their 
papillosity. They are frequently markedly rugulose at back 
above, as in several species, but in addition to this in most leaves 
all the upper cells bear a high single median papilla so that 
the leaf is strongly scabrous. Curiously, however, among the 
normally papillose leaves there are frequently found branches 
with slightly longer and narrower leaves which are entirely or 
almost entirely smooth; a very marked example of dimorphism. 
A certain degree of rugulosity is frequent in the narrow-leaved 
species of Acroporium, and a few species have occasionally at 
least a distinct central papilla on the cell lumen-—though this 
is rare—but I know of no species where it is so marked and so 
highly developed as here; in fact the leaf may be said to have 
