Dixon: NEw MossEs FROM MALAY PENINSULA 249 
The exceedingly interesting genus Acroporium has its centre 
in the Indo-Malayan region. Of 75 species included by Broth- 
erus in the ‘‘Musci,”’ 42 occur in this region (including New 
Guinea), and are indeed confined to it; as compared with 13 in 
Africa, 12 in Oceania, and 8 in America. Since the publication 
of that work at least a dozen new species have been described 
in the area; the present paper describes 11 additional ones, and 
I have two or three further undescribed ones from Borneo, in 
my herbarium. Probably 60%, therefore, of the species belong 
to this region, very few of them, or indeed of any species of the 
genus having at all a wide range. 
Acroporium serrulatum Dixon sp. nov. (PLATE 4, FIG. 5) 
A. cuculligero (Bry. Jav.) proximum; minus; rami breviores, 
nec attenuati, nec gemmipari; foliis paullo latioribus, e basi fere 
conferte serrulatis; areolatio pellucida, nunc laevis, nunc dorso 
sparse papillosa, e cellulis multo brevioribus minoribus, parietibus 
incrassatis; bracteae perichaetii suberectae, sensim in subulam 
haud flexuosam, densissime, argute serrulatam, fere spinulosam, 
angustatae. 
Seta plusminusve I cm., crassiuscula, superne humillime 
ruguloso-papillosa; theca paullo major, inclinata vel horizontalis, 
operculo rostello longiore, deflexo. 
HAB. Penang Hill, Pulau Penang, 1898; Ridley (750). 
Ibidem, 1896 (547). 
This very pretty little plant is very close to A. cuculligerum, 
and would be placed by Fleischer in his new genus Clastobryella. 
It differs however quite markedly from that species in several 
respects. The cells in A. cuculligerum are thin-walled, but owing 
to the cell contents are not translucent, and the leaves always 
have a rather opaque appearance. Here the cells are much smal- 
ler, and thick-walled (the lumen being only about the width of 
the adjoining wall) especially at the cell ends; but both wall and 
cell being translucent the leaf is quite pellucid. The alar cells 
are pale, two or three on each side, and not occupying a large 
proportion of the width of the base. 
The margin in A. cuculligerum is acutely, but distantly 
denticulate; here the serrations are much closer, gradually 
increasing in size and acuteness almost from the leaf-base. The 
seta is stouter, and shorter than it often, at least, is in A. cucul- 
