OF COAL-MEASURE PLANT-IMPRESSIONS. 195 
carbonaceous casts in which the carbon film has flaked off to a considerable 
extent. 
No. 3568. Leaf bases from a wax cast of an intaglio impression from the 
Ten-foot Tronstone of the famous locality of Cosely, South Staffordshire, are 
shown on Pl. 11. fig. 14, enlarged twice. 
This is a branch of small diameter with leaves still attached at the sides. 
The upper leaf bases are perfect, the lower are very imperfect in the 
neighbourhood of the leaf sear. 
Nos. 3249 & 1475. Two stages in decortication of carbonaceous impres- 
sions are also figured in Pl. 11. tig. 15 aud fig. 16. The former is the less 
decorticated. 
The Case for Lepidodendron lanceolatum, Lesg. 
In 1879-80 Lesquereux figured specimens from Pennsylvania under the 
new specific name, L. lanceolatum, Lesq. In 1888 Kidston recognised this 
type in the flora of the Upper Coal Measures of the Radstock coalfield and 
adopted Lesquereux’s name. More recently the present author has figured 
other examples from the Forest of Dean and Wyre Forest fields, and from 
both the Upper an] Transition Coal Measures, This species is, however, 
unknown in the Middle Coal Measures or, indeed, from any horizon lower 
than the Transition series. The references to the above literature will be 
included in the synonymy of L. lycopodioides given in the present paper. 
As to the identity of the British specimens, figured by Kidston and 
myself, with Lesquereux’s plant, in the absence of examples for comparison 
from the Pennsylvania coalfield, one cannot feel absolute certainty, though 
I regard it as extremely probable that they are identical. A critical re- 
examination of these species of Lepidodendra has, however, convinced me 
that the British plant, hitherto assigned to L. lanceolatum, is nothing more 
nor less than L. lycopodioides, Sternb. The leaf bases and the leaf sears are 
identical with those of that species. The only point in which I can find any 
difference is in the size of the leaf bases in certain specimens which are much 
larger than those of any example of L. lycopodioides, Sternb., known to me 
from the Middle Coal Measures. ‘This, however, is immaterial, for examples 
of more slender specimens with leaf scars comparable in size to L. lyco- 
podivides occur in abundance. I figure here three specimens from the 
Upper and Transition Coal Measures which vary in size only. 
No. 1624. On Pl. 11. fig. 17 is shown part of a stem from the Upper 
Coal Measures of the Forest of Dean, some of the leaf bases of which are 
represented in Pl. 12. fig. 18, enlarged three times. This is one of the 
specimens with the largest leaf bases known to me. They measure almost 
17 mm. in length by 4 mm. in breadth. The preservation is particularly 
perfect, though here, as in other cases, the carbonaceous film tends to flake 
