322 The Philippine Journal of Science ms 



latter type predominating; tyloses rare, inconspicuous. Tra- 

 cheitis and fiber tracheids as in D. grandiflorus. Libriform 

 fibers numerous, radially arranged; walls average 8.8 p in 

 thickness. Vertical parenchyma vasicentric and diffuse. Resin 

 cysts diffuse, surrounded by several layers of vertical paren- 

 chyma. Idioblasts wanting. Wood rays 5 by 50 cells in 

 transverse section; ray cells with infiltrations which are not so 

 prominent as those of Parashorea. 



Remarks. — Used for the same purposes as apitong. This 

 species is very widely distributed in the Islands from northern 

 Luzon southward to Basilan. It is frequently tapped for resin 

 which is used for calking ships. 



DIPTEROCARPUS LASIOPODUS Perkins. Hagakhak. (Plate 13.) 



Gross features. — The wood, like that of D. vernicifluus, is 

 scarcely to be distinguished from apitong in general appear- 

 ance; specific gravity, 0.699. 



Microscopic features.— Vessels large, 88 to 294 p (average, 

 228) in diameter; generally more variable and of smaller aver- 

 age size than the two preceding species. Tracheids wanting. 

 Fiber tracheids common, proximate to the vessels. Libriform 

 fibers numerous, 26 by 1,620 M , zonate and compressed at 

 intervals, indicative of restricted growth. Vertical parenchyma 

 and resin cysts as in Dipterocarpus grandiflorus. Idioblasts 

 wanting. Wood rays 4 by 50 cells in transverse section, usually 

 with infiltration products. 



Remarks.— Used for the same purposes as apitong. Like 

 apitong and panau, hagakhak is found in virgin forests asso- 

 ciated with other dipterocarps. Reported from northern Luzon 

 southward to Zamboanga and Basilan, and said to be especially 

 abundant in Mindoro. 



THE PALOSAPIS GROUP 



The palosapis group comprises the five species of Anisoptera 

 that are found in the Islands. The woods are practically alike 

 in their general features and cannot be separated on superficial 

 examination. Since this genus does not produce wood belong- 

 ing to other groups, the following description applies to the 

 genus itself. 



Gross /ea^res.-Sapwood pale white, turning to gray or 

 brown, medium thick; heartwood pale white to yellowish when 

 freshly cut, occasionally with pink or rose red streaks, turning 

 pale yellow with age. Texture coarse. Pores large, conspicu- 



