78 
shaped excrescences arise, fixed on the leaf-blade by a slender 
pedicel. When young they are of a pale green, afterwards they 
turn more yellowish. The 
club itself is irregular in 
shape, mostly lop-sided (see a 
fig. 17). The biggest speci- a 
mens were 5 mM. thick : 
and 6 mM. high. On the 
under-side of the leaf hardly 
anything of the galls is 
noticeable, except’ a small 
orifice communicating by 
means of a narrow tube 
in the pedicel with the gall- “ 
Ss 3 '2 cavity. This gall-cavity is 
Fig. 17. Premna integrifolia L. spacious but without any 
internal excrescences, as 
may be seen in the illustration subjoined. 
The plant was first met with on the excursions of 1906 and 
is now quite general on the islands. 
On Verlaten-Eiland however I did 
not meet with any plant bearing 
ak: of Krakatau, Casuarina- 
forest near the sea, Herb 
N°. 3509. April 24the 1919. 
N°. 18. Zerminalia Catappa L. 
me A leaf-gall caused by a 
_ gall mite. 
_ ‘These are small galls shaped like 
pins heads mostly situated beside 
the strong off-shoots of the mid- = 
ribs (see fig. 18). pate their pened ae eat n oe cic 
