Chap. IV] TROPICAL DISTRICTS CONSTANTLY MOIST 331 



the scale-like stipules develop more quickly than the blade and enclose 

 the bud. In several species of Wormia the bud is enclosed by wing-like 

 outgrowths of the petiole (Figs. 172, 5, and 174). 



Very peculiar are the chambers occurring, in some woody plants, 

 between the petioles of next older leaves, which in such cases always stand 

 in whorls of two or more. The chambers are formed by the adhesion 

 of the lower edges of the petioles and above are provided with a slit, 



Fig. 172. Foliage buds of tropical woody plants from the botanic garden at Buitenzorg. 

 i. Alstonia verticillosa. 2. Tectona Hamiltoniana. 3. Garcinia ferrea. 4. Wormia ochreata. 

 5. Wormia triquetra. Natural size. Drawn by R. Anheisser. 



out of which in time the completely concealed terminal shoot protrudes. 

 P. Groom has described and figured such structures (Fig. 173). I have 

 observed in the Buitenzorg garden a similar method of bud-protection 

 in Calpicarpum Roxburghii, Alstonia verticillosa (Fig. 172, 1), Garcinia 

 Livingstonii, and G. ferrea (Fig. 172, 3). The phenomenon is most striking 

 in Alstonia, in which the chamber is formed by the bases of the petioles of 

 the four leaves of the whorl and its opening is occluded by a spherical drop 

 of resin. The stipular and petiolar chambers contain resinous or mucilaginous 



