24: MAI PLUANG. 
Mai Pluang ( Dipterocarpus tuberculatus ) is a 
very large tree aud grows straight. The characteristics 
are Calyx one- leaved, permanent, two of the five divisions 
of its border large and growing with the pericarp on two 
very long, scariose wings. Corol five-petalled, germ sup- 
erior, three celled, cells two seeded, attachment inferior, 
Nut ovate one celled, and one seeded. Embryo inverse, 
no perisperm. The body of the calyx of D. tuberculatus 
is spherical with knobs under its five fissures on the out- 
side. The leaves are about 5 cm. long. The bark is 
thick and grey. The wood is of a red brown colour. The 
pores are large and round, filled with resin, the medullary 
rays are prominent and moderately broad witha number 
of fine rays between each pair of broad ones. Immense 
tracts of Pluang forests exist in Siam, but the wood being 
brittle is inferior than the other hardwoods described in 
this work. The wood is good for planks aud interior 
parts of permanent buildings but should not be dso for 
bridge building. It is mentioned because it could be 
mistaken for Mai Teng, at first sight. The weight is 830 
kg. per cbm.P=518. 
