226 FLORA OF LOWER COAL MEASURES OF MISSOURL 



The above notes cover the essential details of the species, so far as I 

 can discern them, in the compressed specimens before me. But mention 

 should be made of a number of other peculiarities in this singidar as well 

 as problematic tree. 



To illustrate one of these I have partially rejDresented in PI. LX^^I, 

 Fig. 3, an impression or a mold to which the ej^idermis adheres. The mar- 

 gins of the outer boss appear to come ncarl}^ in contact with the margins of 

 the bolsters in the upper part, althougli the latter can easily be traced to their 

 apex, then curving inward and slightly downward, while becoming obscure, 

 to meet the oval boss a little below its apex, thus producing a somewhat 

 cordate effect. This aspect of the bolster and bosses is surprisingly- like that 

 figured as the type of LepidopMoios obcorclatus by Professor Lesquereux.^ 

 It is possible that both are referable to the same species. The oval bosses, 

 as well as the central mammillfe, are A'ery clear in tliis specimen. 



Another fragment, a part of which is photographed in PI. LXVI, Fig. 4, 

 shows but a faint and fragmentary trace of the bolsters here and there. 

 The surface is nearly flat, the larger bosses being nearly obliterated, only 

 the leaf angle and the oval bosses being left in slight relief Both the inner 

 and the outer borders of the oval boss are defined, as is imperfectly seen in 

 the photograph. This stem, the epidermis of which is in part preserved, is 

 further oi'uamented by several large, shallow pits of two sorts. The larger 

 ones, in the lower portion of the specimen, are nearl}- circular, and nearly 

 equal in size the larger bosses of the other specimens. The details of their 

 interiors are obscure. They show, however, traces of the two low, rounded, 

 vertical ridges passing across them, Avith a central oval trace. These shallow, 

 rounded pits, which are possibly caused by collapse of the large bosses, 

 may conform with the convex areas in the bolsters in the types studied by 

 Lesquereux, the vertical furrows and trace agreeing perhaps with the ridges 

 and trace in No. 5502 of the Lacoe collection. The other form of depression 

 seen in Fig. 4 is often elliptical, traversing vertically the obscurely indicated 

 and wrinkled outline of the large boss. These elliptical pits are evidently 

 coincident with the area and position of the A^ertical, rounded furrows seen 

 in the round pits on the same fragments. The leaf angle and o\-al boss are 

 wholly obscured. This elliptical or horseshoe appearance of the vertical 

 ridges crossing the larger bosses, while never conspicuous in any of the 



' Kept. Geol. Smv. Hliuois, vol. ii, 1866, p. 457, pi. xll. fig. 1 (uot fig. 2. 2a). 



