DOCTERS VAN LeeuweN: Some galls froni Hongkong. 



275 



No. 21. Ipomoea spec. 



A leaf, pétiole and stem gall caused by a gallmite. 



On the leaves they are developed on both sides. On the upperside 



more or less hemi-spherical; on the underside conical, with an opening on 



the top of the gall ; about 



2 mm. in diameter. On the 



pétioles and stems they are 



conical or oval outgrowths 



of the bark with an aper- 



ture on the top of the gall. 



See figure 14. The inside 



of the gallchamber is divid- 



ed by outgrowths from the 



inner wali. 



Lj , . il • 1 Fier. 14. Mite-galls on ipomoea spec. nar. size. 



Hongkong, in a thinly ^ 



wooded locality, about 300 feet above seaievel, 8 Nov. 1920. No. 4924. 



New-Territory, Sha-Tin, underbrush, 10 Nov. 1920. No. 4952. 



No. 22. Nephelium longana CAMB. 



A leafgall caused by a gallmite. 



On the uppersurface of the leaf are developed irre- 

 gular oval bladders, 2—10 mm. in diameter. See the 

 subjoined figure 15. On the reverse side the bladders 

 are covered with a white erineum, which later becomes 

 brown. 



Hongkong, Botanic Garden, 6 Nov. 1920. No. 4917 



No. 23. Nephrolepis hirsutula PR. 

 A leafgall caused by a gallmite: Erïophyes paiiro- 

 piis Nal. 



A very common gall of the tropical countries of 

 Asia. Irregular conical or ballshaped excrescences of the 

 leafblade situated mostly on the edge of the leaf. 



Mr. V. ALDERWERELT VAN ROSENBURGH the well 

 known fern specialist of the Buitenzorg Herbarium told me 

 that the plants collected by me belong to a form between 

 N. hirsutula PR. and N. tonientosa V. A. V. R. Both forms 

 are not described in the flora of Hongkong. Judged by the flora of 

 Hongkong, 1 should think my spécimen is N. exaltata SCHOTT. 

 Hongkong, Botanical Garden, 6 Nov. 1920. No. 4915. 

 Literature: D. v. L. Java 1. No. 16, fig. 11. 



D. V. L. Ueber die von Eriopliycs pauropus Nal. an verschiedenen Arten 

 von Nephrolepis gebildeten Blattgallen. Annales du Jardin botanique. Vol. 

 XXXI. 1921. p. 83. 



Fig. 15. Mite-galls on 

 Nephelium longana 

 Camb, nat. size. 



