Corky Excrescences on Stems of Zanthoxylum. 165 
Simarubeae. 
Ailanthus malaharica . Photograph, purporting to be of this plant, 
in the possession of Mr. M. C. Potter, taken at Peradeniya. 
Rhamnaceae. 
Zizyphus, nov. sp. (?). Kew Museum : cones in pairs, and with 
remains of branch between each pair. 
Leguminosae. 
Erythrina cajfra. Kew Museum : cones 2 J x 2 inches at base and 
ij inches high, each bearing a minute thorn at the top. 
E. sp. (?). ‘ Capewood,’ Kew Museum : fine long cones. 
E. Crista-galli. Kew Museum : grown at Kew, with bark half an 
inch thick with thorns still attached. There are no separate 
cones. 
E. lithosperma. Cambridge Museum : specimen brought from 
Ceylon by Mr. Potter. The thorns have a hard woody base, 
and are readily detached with their rounded base from the 
decaying bark. 
E. indica (?). 
E. stricta. Kew Museum : like Crista-galli , from Darjeeling. 
Robinia Pseudacacia . Cork formed beneath the thorns, but no 
cones. (Mittmann, 1 . c.) 
Caesalpinia japonica. Kew Museum : blunt protuberances with 
thorns rubbed off : from Nagasaki. 
C. Nuga. Cambridge and Kew Museums. (Fig. 1 3.) 
C. Sappan. Kew Museum : picture of plant with thorns on corky (?) 
bases : from India Museum. 
C. sepiaria. Gamble, xvii. 
Mezoneurum cucullatum. Gamble, 134. 
Piptadenia macrocar pa — one of the plants known as Angico — (Kew 
Museum) has excrescences exactly similar to the more irregular 
Zanthoxylum ones, but whether arising from thorns or not does 
not appear. 
Acacia pentaptera. Kew Museum : for description see above, p. 1 60. 
Acacia (?). Kew Museum : collected by Burchell, with thorns 
seated at apex of very long cones, reminding one of the older 
stages of Caesalpinia Nuga. 
Acacia (?). Kew Museum : collected by Sir J. D. Hooker in 
Khasia, with well-marked cones. 
Rosaceae. 
Rosa. A corky layer formed at the base, but no cushion formed 
(Kauffmann). 
