ASTEROPHYLLITES. 145 
plants appear to be closely related to the Lepidodendra ; 
their mode of branching is shown in a beautiful speci- 
men (in the museum of the Leeds Philos. Soc.) figured 
and described by Mr. Denny, which is also remarkable 
because it indicates the probability that the Haloniz, and 
the fossil stems, termed Knorris, are identical ; for the 
Specimen in question, which in its branches is unquestion- 
ably of the former type, has the base of the stem impressed 
with the leaf-scars of the latter. 
Knorria. —To this genus the authors of the Fossil Flora 
of Great Britain referred those stems which have projecting 
leaf-scars, arranged spirally. The beautiful specimen figured 
as Knorria taxina, Lign. 41, fig. 2, closely resembles a 
young branch of Yew (Yaxus), and perhaps might be more 
correctly named Tasites. 
Lothrodendron and Ulodendron.— These genera, together 
with Megaphyton, are stems of a very remarkable character, 
and are easily distinguished by the vertical rows of large 
and distant scars. The two first have two series of very 
deep oval depressions on opposite sides of the stems, ar- 
ranged alternately in the specimens I have examined: from 
the size and form of these obliquely-oval cavities, it is sup- 
posed that they were formed by the attachment of cones, 
and not by petioles; but their real nature is involved in 
obscurity.* 
In Megaphyton, the large ovate scars indicate the attach- 
ment of deciduous branches or gigantic leaves, which did 
not grow all round the stem, but in a regular order of 
superposition on each side.t 
ASTEROPHYLLITES.—I1 shall conclude this notice of some 
of the most characteristic trees of the Carboniferous Flora, 
with an account of a tribe of plants whose remains are so 
* Figured in Bd. pl. lvi. + Figured in Pict. Atlas, pl. xxv. 
VOL. I. L 
