164 The Philippine Journal of Science wis 



The commercial woods, in their order of apparent abundance, 

 are: 



1. Apitong. 7. Mangasinoro, including 



2. Red lauan. kalunti. 



3. White lauan, including al- 8. Palosapis, or mayapis. 



mon . 9. Mangachapuy, or daling- 



4. Tanguile. dingan. 



5. Guijo. 10. Narig. 



6. Yacal. 



APITONG 



This is the wood furnished by any and all species of Diptero- 

 carpus. That from Dipterocarpus grandiflorus 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. obconicus Foxw. 



D. affinis Brandis. D. cuneatus Foxw. 



D. trinervis Blume. D. warburgii Brandis. 



D. gracilis Blume. D. speciosus Brandis. 



D. hasseltii Blume. D. basilanicus Foxw. 



D. vernicifluus Blanco. D. grandiflorus Blanco. 



D. subalpinus Foxw. D. philippinensis Foxw. 



D. caudatus Foxw. D. orbicularis 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. 



