164 The Philippine Journal of Science ms 
The commercial woods, in their order of apparent abundance, 
are: 
1. Apitong. 
2. Red lauan. 
3. White lauan, including al 
mon. 
4. Tanguile. 
5. Guijo. 
6. Yacal. 
APITONG 
This is the wood furnished by any and all species of Diptero- 
carpus. That from Dipterocarpus grancliflorus Blanco seems to 
have been the one first recorded under this name. Commercially, 
it seems to be impossible to distinguish among the different 
species, when one is handling logs or converted timber. The 
species furnishing the wood apitong are the following of the 
genus Dipterocarpus: 
Dipterocarpus pilosus Roxb. 
D. affinis Brandis. 
D. trinervis Blume. 
D. gracilis Blume. 
D. hasseltii Blume. 
D. vernicifluus Blanco. 
D. subalpinus Foxw. 
D. caudatus Foxw. 
D. perturbinatus Foxw. 
Apitong is the most abundant wood in the Philippine Islands, 
apparently making up about 20 per cent of the volume of our 
commercial forests. 
RED LAUAN 
This is the name applied to the wood of a number of closely 
related species of Shorea, which have rather soft, reddish, usually 
rather coarse-grained wood. There are differences in color and 
grain among the different forms of red lauan. It is not so 
uniform in quality as apitong. Collectively, the different red 
lauans are more abundant than apitong, constituting about 21 
per cent by volume of our forests. A very good red lauan, which 
has been exported to a considerable extent, is that furnished by 
Shorea negrosensis Foxw. Other species that furnish woods 
known as red lauan are: Shorea warburgii Gilg, S. squamata 
(Turcz.) Dyer, S. rugosa Heim, S. plagata Foxw., and possibly 
Parashorea plicata Brandis. 
D. obconicus Foxw. 
D. cuneatus Foxw. 
D. warburgii Brandis. 
D. speciosus Brandis. 
D. basilanicus Foxw. 
D. grandiflorus Blanco. 
D. philippinensis Foxw. 
D. orbicularis Foxw. 
7. Mangasinoro, including 
kalunti. 
8. Palosapis, or mayapis. 
9. Mangachapuy, or daling- 
dingan. 
10. Narig. 
