STR ee ee 
ee, 
Mr. J. Miers on the Tribe Colletiez. 5 
be no doubt that the gonangium in Laomedea is the homologue of 
a hydrotheca: so that, if we admit the validity of Prof. Huxley’s 
objection, we must, on the same grounds, refrain from calling 
by one name the polype of Tudbularia, where no hydrotheca 
exists, and that of Laomedea, which is protected by a hydro- 
theca,—a practice which few would venture to adopt. 
11.—On the Tribe Colletiex, with some Observations on the 
Structure of the Seed in the Family of the Rhamnacee. By 
_ Joun Miers, F.R.S., F.L.S. &e. 
[Continued from vol. v. p. 492.] 
8. TALGUENEA. 
The characters of this genus have been imperfectly known, 
but they are sufficiently distinct from all others of the Colletiee, 
especially from Trevoa, with which it has been confounded. It 
was originally proposed by me, in 1825, for the plant which I 
called Talguenea costata, after its vernacular name of Talguén; 
but Sir Wm. Hooker, in 1830, who had not then seen the fruit 
of Trevoa, considered it to be congeneric with the latter genus ; 
and, on the authority of Dr. Gilles, he suppressed Talguenea, 
and placed the two typical plants as distinct species of Trevoa 
(Bot. Mise. i. 158). The former celebrated botanist, in 1833, 
having then seen the fruit of Zrevoa, was induced to suppress 
that genus, and to refer 7’. ¢rinervis to Retamilia, and at the same 
time (Bot. Mise. ii. 174) he first adopted the genus Tulguenea 
as I had originally proposed it. It is strange that Dr. Gillies 
should have confounded two plants so totally distinct, as not only 
had he ample opportunity, while he resided with me at Concon, 
of examining them in the living state, but he also saw my draw- 
ings, in which their characters are fully shown. Colla, claim- 
ing the authority of Bertero, referred both Talguenea and Trevoa 
to Colletta (Mem. Torin. 37. p. 53). The prominent charac- 
teristic of Talquenea lies in the structure of its fruit, which con- 
sists of an indehiscent membranaceous carcerule, surmounted 
by its enlarged persistent style, of nearly equal length, and en- 
closed in its entire and unchanged calyx, which is perfectly free 
from it and about three-quarters of its length. The ovary is 
always 3-locular, each cell having a single erect ovule, but of 
these seldom more than one is perfected; the fruit, however, is 
occasionally 2-locular, or more rarely 3-celled. Among other 
peculiarities, we see in all the axils of Yalguenea a very large 
squamose tubercle growing beneath the spines, from which issue 
many crowded fasciculated leaves and flowers; whereas in Tre- 
voa, as before shown, this tubercle becomes extended into an 
