LYCOPODIALES— LEPIDODENDRE.E— LEPIDODENDKON. 1 89 



length being- more tlian ten times the breadth, tapering to very slender, flexuons 

 tips in moderate relief, convex, the lower half and the upper portion above 

 the foliar cicatrice distinctly marked by irregular, rather coarse transverse 

 corrugations ; leaf cicatrices a short distance above the middle of the 

 bolsters, moderately protuberant, broad, crescentic, very narrow vertically, 

 concave-convex upward in plan, the upper margin round-convex, slightly 

 mucronate at the top in correspondence with the base of the midrib, the 

 lower margin concave, forming an imperfect arc of from 130° to 160°; 

 ligular trace obscure, mammillate, close above the leaf cicatrice ; append- 

 ages oblong, close on either side of the base of the midrib, and inclined 

 somewhat outward ; leaves thin, linear-lanceolate, tapering from near the 

 broad base, which is nearly the whole width of the bolster, to the slender 

 acuminate apex, 10 to 60 mm. or more in length, thin, ventrally concave 

 at the base, which is open, or often reflexed, tlien outward curved, generally 

 turning upward, giving a plumose aspect to the slender twigs, and often 

 adhering to stems of considerable size ; midrib distinct, rather narrow, 

 dorsally round, diminishing gradually to the apex. 



This well-marked representative of an ancient group is excellently rep- 

 resented among the abundant material collected by Mr. Van Ingeu from 

 Hobbs's mine, where it is especialh^ common. This is perhaps the type 

 locality. The mine from which the originals described by Professor Les- 

 quereux were obtained is not stated. It is certain that all the specimens 

 came from the vicinity of Clinton. The distinct, irregular, transverse 

 wrinkles, which' ornament the rounded surface of the bolster both below 

 and above the leaf, and which constitute the most conspicuous specific char- 

 acter, as will be seen in PI. LIT, Fig. 3, are present and observable in even 

 the small twigs. The bolsters are usually very slender and acuminate, 

 though often broadened somewhat, approaching nearer the L. Volkmcmnianimi 

 in the older stems. In the form of the leaf scar, also, it shows its relation 

 to the latter species, for, instead of being "transversely oval" as originally 

 described and figured,^ they are more or less regularly crescentic, the horns 

 of the crescent reaching nearly to the sides a little above the middle of the 

 bolsters. The upper convex border of the scar generall)' forms a sweeping- 

 curve of about 160°, with a slight interruption of the line over the vascular 

 scar. The latter often forms a narrow keel, especially in the older branches, 



I Lesqnereiix, Coal Flora, vol. ii, p. 368, pi. Ixiii, tigs. 1, In, U, 2. 



