7 CE 
On the upper-side they are hardly visible. On the under-side 
on one side of the top there is an aperture giving access to the 
gall-cell. The entire wall makes the impression of a strongly 
developed callus-tissue. 
Island of Krakatau. Herb. N°. 3547, April 24th 1919. 
Literature: 4) Beitrag VI. Bull. d. Jard. Bot. de Buitenzorg. Série I. N°. III, 
1912. N°, 349, p. 
2) Gallen aus Celebes. ie. Idem. N°. XXI, 1916. N°. 70. Figure 70. 
*N* 24, Wedelia biflora Bl. 
A gall of the stem-apex caused 
by an Aphis. 
A typical aphida-gall consisting of bun- 
ches of poorly developed leaves (see fig. 24). 
On Verlaten-Eiland this infection was very 
general; the plants attacked looked a 
and bore no flowers. 
Mr. van per Goor informed me_ that 
the gall-producer probably belonged to the 
polyphagous Aphis malvae Koch, found by him on numerous 
Javanese plants. 
Verlaten-Eiland. Herb. 3727 b, Apri 27th 1919 and Herb. 3832, 
October 6th, J919. 
Fig. 24. Wedelia biflora Bl. 
Buitenzorg, October 1919. 
