T.ENIOPHYLLE.E— T.ENIOPHYLLUM. 251 



the leaves of T. decurrens, whicli is nearest to the species from Missouri, 

 differ only by the rather small size, the greater infrequency of the branch- 

 ing, and the slightly finer, usually more obscure, nervation. 



The leaf scars on the main axes appear also to be umbilical though 

 very narrow, being, in fact, linear-ovate. This is the case on all the seg- 

 ments of main axis found, including No. 9256 of the Lacoe collection, a 

 part of which is seen in fig. 1 on pi. Ixxxi of the Coal Flora. The V-shaped 

 traces delineated in that figure erroneously represent merely the round 

 lower ends of the leaf scars. The generic identity of the plants from 

 Missouri and Pennsylvania is strong and most unequivocal. 



With regard to the relations of the plants in the genus Tainiophyllum, 

 little that is conclusive can yet be said. When first describing the genus ^ Pro- 

 fessor Lesquereux was disposed, on account of the form and supposed mode 

 of attachment of the leaves, to associate it with the Grymnosperms, though 

 regarding it as perhaps constituting a family distinct from the CordmtecB. 

 Later, in the second volume of the Coal Flora,^ he describes the occurrence 

 of spores in the cavernose leaves, and ranks the genus with the Lycojwdiacece, 

 with a suggested comparison with Isoetes, a comparison and presumed 

 relation that are emphasized in the third volume^ of the same work. These 

 spores are present in two or three of the specimens in the collection. Thev 

 are undoubtedly macrospores of the TrUetes type, and, since I am unable 

 to find any of them actually within the leaves, their position l^eing, on 

 the other hand, in groups or singly scattered irregularh' about among the 

 leaves,'' I am led to regard them as extraneous. It seems probable that, as 

 frequently happens with these bodies, they were lodged or drifted amono- 

 the leaves of the Tceniophyllmi, just as were the pinnules of Linopteris 

 and fragments of Pecopteris found associated with the group of spores in 

 one of the specimens from Cannelton, and should not therefore have great 

 influence in any speculation as to the affinities of the genus. 



A circimistance of considerable interest, if not significance, is the 

 association, described in one specimen by Lesquereux,^ of the leaves of 

 Tceniophyllum with the Caulopteroid fern trunks published by him as Stem- 

 matopteris Schimperi. The specimen. No. 9250 of the Lacoe collection, 



' Trans. Amer. Phil. Soc, vol. xvii, 1878, p. 330. -P. 463. =P. 788. 



■>In Tmniophyllnm brevifoHum Lx. they are not described as found within the leaves. See Coal 

 Flora, vol. iii, p. 788. 



'Coal Flora, vol. ii, pp. 462, 463. 



