330 The Philippine Journal of Science 192s 



SHOREA MINDANENSIS Foxworthy. KALUNTI. (Plate 21.) 



Gross features. — Sapwood whitish, narrow, sometimes turning 

 to grayish brown and becoming darker than the heartwood; 

 heartwood nearly white when fresh, turning yellowish or yel- 

 lowish brown on exposure. Wood fine textured and cross 

 grained, moderately heavy, specific gravity, 0.532. 



Microscopic features. — Vessels fine to medium, 59 to 250 fx 

 (average, 200) in diameter, terete or rounded in transverse 

 section, solitary or in groups of 2 or 3; tyloses sparse. Tra- 

 cheids few. Fiber tracheids wanting. Libriform fibers numer- 

 ous, medium-sized, 21 by 1,360 ^ arranged in distinct radial 

 series. Vertical parenchyma vasicentric and diffuse, the latter 

 inconspicuous. Resin cysts inconspicuous in interrupted concen- 

 tric lines, horizontal resin cysts present. Horizontal idioblasts 

 common; vertical idioblasts sparse or wanting. Wood rays 

 broad and high, 6 by 100 cells. 



Remarks. — Used for cheap construction, piling, and tempo- 

 rary structures. Not durable when exposed or in contact with 

 the ground. Difficult to saw in spite of its softness, even in 

 large band mills, and hence not lumbered to any extent and not 

 well known in the market. The only Philippine dipterocarp of 

 those studied with horizontal resin cysts. 



Shorea mindanensis is confined wholly to Mindanao, where it 

 is relatively abundant. 



PARASHOREA MALAANONAN (Blanco) Merrill. Bagtikan. (Plates 6, 

 7, 8, and 22.) 



Gross features.— Sapwood white, medium thick; heartwood 

 grayish red, often with a brownish cast. Wood coarse and 

 uneven textured, 41 cross grained, moderately hard to hard, 

 moderately heavy; specific gravity, 0.593. 



Microscopic features. —Vessels large to very large, 73 to 317 h 

 (average, 275) in diameter, terete to oblong in transverse sec- 

 tion, solitary or in groups or strings of 3 to 15; tyloses sparse. 

 Tracheids relatively abundant, proximate to the vessels. Fiber 

 tracheids wanting. Libriform fibers numerous, medium-sized, 

 22 by 1,540 /*; radial arrangement less distinct than in kalunti. 

 Vertical parenchyma vasicentric, vasicentric-zonate, or diffuse. 

 Resin cysts in interrupted concentric rows, rarely solitary. 

 Horizontal and vertical idioblasts present. Wood rays broad and 

 high, 6 by 60 to 90 cells. 



lauaans, owing to the 



