File:The Quarterly journal of the Geological Society of London (12981462484).jpg

1859..
DAWSON DEVONIAN PLANTS.
481
lotum*, with which these plants very closely correspond in all ex-
cept their rhizomes and the circinate terminations of the branchlets.
The name proposed above is intended to express this relation, as well
as the most apparent distinction between these plants and those of
the genera Lycopodites and Selaginitesf. To the species above-
described I would give the name of Psilopliyton princeps. I have
attempted a restoration of its general appearance in fig. 1 i.
Some of my specimens appear to indicate a second species, charac-
terized by more robust stems, more finely ridged, and having slender
alternate branches, which bifurcate frequently and usually bend
Fig. 2 a.
Fig. 2 b.
Fig. 2. Tdlo'phyton robustius. a, stem ; b, markings of stem (nat. size), ligneous
surface.
downward. The specimens are not well preserved, but are very
distinct from P. pnnceps, while probably generically related to it.
I would name this species P. rohustius (figs. 2 a, h).
Neither of the species exhibit distinct fructification. Certain
obscurely cuneate carbonaceous spots attached to the sides of the
branches of P. princeps are, perhaps, of this character ; and the ob-

• See Brongniart, Veg. Fos. yd. ii. pis. 6 & 11. I have been favoured by Prof
  

Gray, of Harvard College, with specimens of P. flavidum from Tahiti and P.
triquetrum from Australia, which closely resemble the fossils in structure and
surface-markings.
t I should have preferred the term " Psilotites ; " but this has been preoccupied
by a Jm'assic plant, of which, however, I cannot find any detailed description.