772 DOMATIA IN CERTAIN AUSTRALIAN AND OTHER PLANTS, 



parenchyma is also composed of oval cells, with small and few 

 intercellular spaces. The hairs have an enlarged cell at the base 

 and are thick-walled and destitute of contents. 



R. CHARTACEA, F.v.M. — In herbarium specimens imperfect 

 domatia, and bunches of hairs were seen in the axils of midrib 

 and secondary veins, but fi'esh leaves showed no sign of them. 

 I cut sections through the axils and found a few minute hairs, but 

 no approach to the characteristic structure described in the fore- 

 going species. I was struck, however, by the packing of large 

 collenchyma cells on the upper side of the midrib and veins. 

 These stained very deeply, and when tested with ferric chloi'ide 

 gave the same purple reaction as H. Moorei. 



MoRiNDA JASMINOIDES, Cunn. — This is a climbing plant. The 

 cavities are usually high up in the axils of the third pair of veins 

 and midrib. They are opposite or alternate. There are from one 

 to four, but are sometimes absent. The leaves are rather thin, 

 dark green, but not very glossy. The domatia project very 

 much on the upper side of the leaf, and but slightly on the 

 lower. They are very large, and look like blisters or galls 

 externally. They vary from 1-5 mm. long. The openings are 

 sometimes of the full size of the cavity, but usually they are 

 small and circular. There is sometimes a ridge parallel with the 

 vein, thus forming a channel leading to the orifice. The rim is 

 slightly thickened and lighter-coloured than the rest of the leaf. 

 Manj"- vessels occur in it and in the roof. Ordinarily there are no 

 hairs on the interior, which is quite smooth and has large stomata 

 in all parts. The minute structure, as seen in transverse sections, 

 differs somewhat from that found in the previous plant. Begin- 

 ning as before at the summit of the roof on the upper surface of 

 the leaf, we meet with : — 



(1) A thin cuticle. 



(2) An epidei'inis here composed of very large oblong cells with 

 thin walls, the longer diameter being horizontal. But over the 

 rest of the lamina, the cells are longer vertically, and of great 

 depth in proportion to the mesophyll. The upper and lower 



