*N°. 11. Nauclea purpurascens Korth. 
A leaf-gall formed by a gall-mite. 
A very simple gall, not yet re- 
ported from Java or Sumatra. On 
Krakatau it was very common, 
occurring both near the shore and 
at higher levels on the mountain- 
sides. 
Large, very flat bladders arise 
on the upper side of the leaf, 
usually occupying the whole area 
between two main off-shoots of 
the midrib (see fig. 13). As a re- 
sult the leaf is often strongly 
folded at the distal end. On the 
under-side this bladder is clothed 
with a very thin erinaceous growth, Fig. 18. Nauelea purpurascent. 
consisting of very small hairlets. These are partly uni-cellular, 
partly pluri-cellular. They consist of a slender pedicel gradually 
swelling into a club or cudgel shape. 
Island of Krakatau. 
Herb. N°. 3621, April 25th 1919. 
N°. 12. Nephrolepis biserrata Schott. 
A leaf-gall formed by a gall-mite, Eriophyes pauro- 
pus Nal. 
‘This is one of the most widespread galls of these islands; it is 
_ especially prevalent on Krakatau. It was already mentioned in the 
__ first contribution of descriptions of Javanese galls, ') and *), but 
= it afterwards appeared that the specimens discussed there did 
et belong to the plant above mentioned, but to W. hirsutula Pr. 
= * description of all the galls formed by Hriophyes pauropus Nal. *) 
: on several varieties of Nephrolepis was published *) last year. 
angee of these galls found on Krakatau belong to the usual 
h re nothing but thickenings - of the leaf-margin. 
| to the — 
uction | for a eae: more a 
