77G DOMATIA IN CERTAIN AUSTRALIAN AND OTHER PLANTS, 



main axils and are very large, with a wide elliptical opening. I 

 could see no hairs present anywhere. 



P. CYMOSA, Ruiz, et Pav. — The pouches occur in the principal 

 axils and have a circular opening. The microscopic structure 

 resembles that of Coprosma lucida, having the same dense layers 

 of palisade-tissue composed of small cells very rich in chromato- 

 phores. The hairs are different, being septate, with as many as 

 thirteen divisions (fig. 9). They have little or no cell contents. 

 There are no stomata in the cavities. 



P. BisuLCATA, . — I have not seen this plant, and I am 



indebted to Mr. E. Betche for the information that Trimen (3) 

 says of the leaf, " Lateral veins often with deep pits in their 

 axils, which appear as warts on the upper surface." 



The above-mentioned jjlants are all in which I have seen this 

 highly developed form of dennatium, but Lundstitim (1) describes 

 a large number of other species which have it, mostly Australian. 



Growp ii. 



Dysoxylum Fraserianum, Benth — The domatia are in the 

 principal axils of the leaf or leaflet; and, so far as I have seen, this 

 form nev^er occurs in the secondaries. Sometimes they are found 

 on only one side of the midrib, but generally on both. They vary 

 in number from one to twelve. The leaves of a plant growing in 

 a shady situation are very dark green and shining, on the under 

 side lighter. From a sunny spot, they are much lighter in colour 

 and smaller. The leaf wets readily on the upper side, but is 

 greasy below. The pits do not appear much on the upper side of 

 the leaf, but on the lower side they are very prominent, some- 

 times pi'ojecting above the leaf surface 3 mm., and then are corky 

 and diseased-looking. The size is on an average 3x2 mm. The 

 opening is wide and arched (fig. G). Vessels occur in the walls. 

 The interior is hairy, the points of the haii's projecting from the 

 mouth. There ai'e no stomata inside the domatium. 



The substance of the domatium roof consists of — (1) cuticle; 

 (2) epidei'mis; (3) close palisade-tissue in two layei's of very 

 narrow cells, which are nearer the normal shape and arrangement 



