260 ~ Mr. J. Miers on the Menispermacez. 
16. Lecidea Dufourei, Ach. 
Est nomen in herbariis variis obvium Lichenis, quem Lecideam 
sabuletorum, f. simpliciorem, dixi in Lich. Scand. p. 205. No- 
men Acharianum restituendum. 
Etiam in Gallia occurrit, in Vogesis (Mougeot) ; atque in 
Anglia (Leighton). 
XXXII.—On the Menispermacez. 
By Joun Mixers, F.R.S., F.L.S., &c. 
[Concluded from p. 175.] 
60. DESMONEMA. 
This genus is. proposed for. a plant from Natal, with cordate, - 
deltoidly orbicular, submembranaceous, glabrous, 5-nerved 
leaves, the nerves branching externally, the petiole being long 
and slender. It has an axillary inflorescence, with a somewhat 
slender rachis as long as, or longer than, the leaves, the whole 
plant so much resembling a species of Tinospora that it might 
easily be mistaken for one. The inflorescence is a simple ra- 
ceme, its rachis being provided at short intervals with a subu- 
late bracteole, half the length of the 1-flowered pedicel which 
emanates from the same point; the flower has six sepals, which 
are ovate, subacute, the three outer being alternate with and 
half the length of the three interior ; six petals in two series, 
the outer ones subcuneately ovate, three-quarters of the length 
of the inner sepals, plane, the three inner ones a trifle shorter, 
linear, one-third their breadth, fuscous, subfleshy, longitudinally 
canaliculated ; three monadelphous stamens as long as the outer 
petals, the filaments being united for three-quarters of their 
length into a central column, the upper extremities being free, 
nearly erect, supporting as many subglobular anthers, which 
are broader than them, 2-celled, the oval cells collateral, without 
intervening connective, each cell opening bivalvately by a some- 
what lateral and subextrorse longitudinal furrow. Desmonema, 
in the feature of its three monadelphous stamens, resembles 
Rhaptonema, Syrrhonema, Detandra, and Sarcopetalum. It dif- 
fers from the first in its subextrorse anthers, in the number and 
shape of its sepals, the kind of inflorescence, the form and vena- 
tion of its leaves, and its very dissimilar habit. Syrrhonema 
differs from it in its introrse 4-lobed anthers, the want of petals, 
the greater number of its sepals, and in the character of its in- 
florescence. Detandra is distinct from it in its anther-cells, a 
far greater number of sepals, the character of its inflorescence, 
its peltate leaves, with another kind of venation. Sarcopetalum 
