256 Drxon: NEw MossEs FROM MALAY PENINSULA 
Acroporium Ridleyi Dixon sp. nov. (PLATE 4, FIG. 14) 
Sat robustum, albescens, nitidum; caules elongati, ad 6 cm. 
longi, complanati, ad 4mm. lati; parce ramosi. Folia plusminusve 
complanata, valde divergentia, saepe horizontaliter explanata, 
2 mm. longa vel paullo ultra, obovato-oblonga, perconcava, apice 
acuto, subconvoluta, integerrima; areolatio specierum duarum 
praecedentium, cellulis alaribus permagnis, pulcherrime auran- 
tiacis. 
Cetera nulla. 
HAB. Gunong Tahan, Pahang, 1911; Ridley (1039). 
A very distinct species in the colour, habit, papillose cells 
and leaf form. 
These three species, A. longicuspis, A. albidissimum, and A. 
Ridleyi, form a new and very distinct group of Acroporium, 
having the general leaf form of Eu-acroporium, but in the highly 
papillose cells coming near to Trichosteleum. The alar cells, 
however, are quite distinctive of Acroporium. The cell structure 
is identical in all three (except that in the present species I have 
found no dimorphic branches), and is very marked, not only 
in the dorsal papillae and rugulosity, but also in the uniform, 
highly incrassate cells. The colour of the present plant is 
whitish, but scarcely so marked as in the last; the leaves are 
quite different in form from both species, and are almost identical 
in outline with those of A. menoicum and A. hermaphroditum. 
Acroporium complanatum Dixon sp. nov. (PLATE 4, FIG. 15) 
Hypno pycnophyllo C. M. (Sematophyllum Jaeg.) affine; 
differt ramis complanatis, foliis bifarie divaricatis, subula multo 
latiore, breviore, robustiore late loriformi, obtusiuscuia, rigida, 
superne dense, argute serrulata. Cellulae laeves vel humiliter 
papillosae. Perichaetium parvum, ut in A. pycnophyllum, sed 
foliorum subula, tanquam foliis caulinis, Jatiore, breviore, lori- 
formi. Seta .75-1 cm. longa, infra laevis, apice grosse nec alte 
papillosa, theca parva, horizontalis, castanea. Peristomium 
saturate rubrum, dentes lati, approximati, dorso fortiter dense 
transverse striolati, linea media irregulari, haud sulcati. 
HAB. Base of Gunong Ledang, Malacca, 1892; Ridley (236). 
Clearly allied to Hypnum pycnophyllum C. M., but differs 
at once in the leaves widely spreading almost at right angles to 
the branch, in one plane, so that the branches are flattened (the 
