ORGANIZATION OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 771 
Nore, ADDED DEceMBER 19, 1895. 
In 1869 M. Renavuur described two specimens from the upper coal-measures 
of Autun, under the names of Lycopodium punctatum, B. Ren., and Lycopodium 
Renault, Ad. Br. (‘Ann. des Sci. Nat.’ (Bot.), Sér. 5, T. 12, pp. 178-185, 
Plates 12-14). M. Renavtr now kindly informs me that in the text of his ‘ Flore 
fossile du bassin houiller et permien d’Autun et d’Epinac,’ Part 2, which I have not 
yet had an opportunity of seeing, he has transferred these fossils to the genus 
Heterangium, I had already convinced myself, by comparison of his figures with 
our specimens, that this was their proper position.: The plants in question have 
nothing in common with Lycopodium, for the structures described as leaf-traces 
in the memoir of 1869 are not really of that nature. Those shown in the inner part 
of their supposed course probably represent medullary rays, while those in the 
cortex are certainly identical with the sclerotic bands so often figured and described 
from the English specimens. (See our figs. 22, 28, and 31; Witzramson, Part IV., 
figs. 32, 45, &c.) 
The agreement in structure with our own species of Heterangium is remarkably 
close. M. Renautt’s H. punctatum is much like our H. tiliwoides, while H. Renaultiti 
recalls the specimen which we provisionally term H. cylindricum. The genus 
Heterangium evidently had a great vertical range in the carboniferous formation.—- 
D. H. Scorrt, 
EXPLANATION OF PLATES. 
Plates 18-20. Lyginodendron Oldhamium. Photographs by the late Mr. W. Kirmay, 
Srom the actual sections. Many require to be examined with a lens. 
PLATE 18. 
Photograph 1. Transverse section of a medium-sized stem passing through an inter- 
node. The outer, or Dictyoxylon cortex is perfect ; the inner cortex only 
remains here and there, especially on the left. /.t.!-1.1.°, the five leaf-traces 
in the pericyle, numbered in order from within outwards. Note that l.t..is a 
single bundle, the rest more or less double (/.t.5 accidentally displaced) ; 
w.'—w.®, the perimedullary xylem-strands alternating with the external 
bundles ; they are numbered according to the leaf-traces on their anodic 
side. Between w. and /.t. are the secondary wood and the phloém. Compare 
Plate 21, fig. 1, and for details see Plates 21 and 22, figs. 2, 3, 5, 6 and 7. 
x 64. O.N. 1640 (see p. 706). | 
Photograph 2. Transverse section of a young stem at the commencement of secondary 
growth. d.c., Dictyorylon cortex ; /.t.’, the innermost of the four leaf-traces ; 
5G 2 
