410 MR. SPENCER LE M. MOORE—PHANEROGAMIC BOTANY 
resemblance between the latter and Solanacee is therefore doubtless merely homo- 
plastic. 
The placentation is perhaps more that of Myoporinee than of any other order either 
of the Personal or the Lamial Cohort—with the exception of Selaginee, which are 
manifestly out of the question ; but their shrubby habit, their sestivation, and anthers 
with confluent cells all conspire, irrespective of geographical considerations, to negative 
the supposition of a Myoporineous affinity for Desdemona. The discovery of an un- 
doubted Myoporineous genus in South America, although by no means impossible, is yet 
so improbable that the affinity would not be admitted without very strong evidence 
being adduced in its favour, and of such evidence there is scarcely any in the 
present case. 
The stem of this plant very early becomes woody, so that study of the arrangement of 
the vascular bundles is rendered difficult, and, with the scanty material at my command, 
quite impossible. "The structure is worthy of notice in consequence of the almost entire 
localization of the sclerenchyme to the four angles, and the great reduction in the hard 
bast (Tab. XX XIX. fig. 1). A transverse section of a stem of one year's growth shows a 
normal girth often, at least in the case of dried material, ruptured in many places, 
. narrow masses of xylem with relatively small tracheides, and very numerous thin medullary 
rays, with walls, under a low power, not easily distinguishable from the xylem. The 
phloém, much less extensive than the xylem, consists of the usual elements, but these 
are very small; at its outer side are seen at intervals isolated bast-fibres, or more usually 
small groups of them. The cells of the cortex are thin-walled, except for the masses of 
sclerenchyme (sc.) already mentioned; there are also a very few scattered sclerotic 
 parenehyme cells (sp.) The epidermal cells are pleated upon their outer wall—this 
pleating is, however, seen better when the leaf is examined, it being sufficient to detach 
a small piece of epiderm from either side of the leaf (fig. 5). Besides this there is 
little worth noting in the leaf-structure, except the great midrib with its large collen- 
chyme cells (fig. 2), and the small glands sessile upon the upper surface; the latter 
emerge from small hollows, close around which on all sides are the epidermal cells 
(figs. 3 & 4). Stomata are found only upon the underside of the leaf. 
GESNERACE. 
DrYMONIA ($ GENUIN®) MACULATA (sp. nov.); caule scandente sat crasso, plus minus 
tetragono, nitido, radices adventivas debiles, parce fibrillosas emittente ; foliis petio- 
latis, ovatis acutis vel obtusis, interdum breviter cuspidatis, basi plus minus angus- 
tatis, margine dentatis, coriaceo-membranaceis, supra scabriusculo-pubescentibus, 
subtus arcte tomentosis; floribus solitariis majusculis; calycis pubescentis lobis 
oblongo-ovatis, obtusis vel acutis, margine serrulatis, lobo postico plane minore; 
corollz calycem circa duplo excedentis tubo postice saccato, limbi lobis ovatis 
fimbriatis posticis minoribus ; disco postice prominulo, antice parvo; ovario ovoideo, 
tomentoso, stylo crassiusculo, pubescente, utrinque amplificato coronato. 
Hab. In truncis arborum scandit ad Santa Cruz, ubi florere incipit mens. Nov. (N. 529.) 
