OF COAL-MEASURE PLANT-IMPRESSIONS. 185 
No. 78. A single sporophyll 2 em. long is shown, natural size, on PI. 9. 
fig. 29. The pedicel here appears to be only a little smaller than the lamina. 
No. 81. A still larger specimen, also figured natural size on PI. 9. fig. 30, 
is 2:3 em. long, and the lamina is distinctly larger than the pedicel. 
No. 65. A smaller and narrower specimen is shown on Pl. 9. fig. 31, 
natural size. 
Distribution. Middle to Transition Coal Measures. 
Transition Coal Measures. | 
Coalfields :—North Staffordshire. South Lancashire. 
Middle Coal Measures. 
Coalfields :—Pembrokeshire. Yorkshire. South Lancashire. 
LEPIDOSTROBUS TRIANGULARIS (Zeiller). (Pl. 9. figs. 32 & 33.) 
Sporophylls detached. 
1886-88. Lepidophyllum triangulare, Zeiller, Flore Foss, Bass. Houill. Valenciennes, 
p. 508, pl. 77. figs. 4 & 5. 
1897. Lepidophyllum Pichleri, Kerner, in Jahrb. k.k. Geol. Reichsanst. vol. xlvii. 
Heft 2, p. 383, pl. 10. figs. 1-2. 
Sporophylls attached. 
1910, Lepidostrobus triangularis, Arber, in Proc. Yorks, Geol. Soc. vol. xvii. pt. 2, p. 149, 
pl. 16. fig. 3. 
Diagnosis.—Cone cylindrical, rather small, 7 or more cm. long and about 
2 cm. across. Sporophyll markedly hastate. Pedicel wedge-shaped, smaller 
than the lamina, 5-8 mm. long, 3-5 mm. broad at its widest point, with a 
single nerve. Lamina triangular, the sides somewhat concave, lower angles 
prolonged, acute, somewhat turned inwards towards the pedicel, 12-15 mm. 
long, 8-12 mm. broad at the base, sharply pointed at summit, with a single 
median nerve. 
Remarks.—This is an infrequent type in Britain, and the sporophylls 
usually occur detached. The only known specimen of a nearly complete cone 
of this species is one collected by Dr. Moysey, which 1 figured some years 
ago from the Middle Coal Measures of Derbyshire, and which is figured 
here natural size on PI. 9. figs. 324 & B. The cone was a small one, about 
7 em. in length and 2 em. across at its widest point. The late Professor Zeiller, 
who saw this specimen, agreed that it was identical with his Lepidophyllum 
triangulare. Part of the stalk of the cone is seen at the base of this specimen, 
but this organ is incompletely preserved, and it is thus impossible to say 
whether this cone should be attributed to a Lepidodendron or a Sigillaria. 
In some respects the sporophylls recall those of certain species of 
Sigillariostrobus. 
