246 FLORA OF LOWER COAL MEASURES OF MISSOURL 



1890. Stigmaria Evenii Ls., Grand 'Euiy, Geol. et pal. bassin bouill. Gard, pL xiii. figs. 



7 B', 13. 

 18S0. Stigmarioides Evenii Lesquereux, Coal Flora, vol. i, p. 333, pi. Ixxv, fig. 1. 

 1890. Stigmarioides Evenii Lx., Lesley, Diet. Foss. Pennsylvania, vol. iii, p. 1077, text fig. 

 1890. Stigmariopsis Evenii (Lx.), Grand 'Eury, Geol. et pal. bassin honill. Gard, p. 243, 



pi. xiii, figs. 7, 13. 



Although the scars on the specimens which I refer to this species are 

 shghtly smaller than those illustrated in fig. 1, pi. Ixxv, of the Coal 

 Flora, they are in perfect agreement with material from Mazon Creek, 

 Illinois, labeled b}^ Professor Lesquereux under the above name. One of 

 the specimens from Missouri is 26 cm. in length, over 15 cm. in width, and 

 nearly flat, thus indicating for the root a great size as compared with the 

 very small umbilical scars. The latter appear to be proportionately smaller 

 than in the specimens figured by Zeiller and Grand 'Eury. M. Grand 

 'Eury illustrates^ a most interesting ei'ect trunk of an unmistakable SigUlaria 

 {S. Mauricii) of the JRliytidolepis group, 150 cm. long, in which the lower por- 

 tion for nearly 75 cm. between the ribbed portion and the point of origin of 

 the roots is slightly dilated, cylindrical, and Syringodendroid in its sculpture. 

 The rapidly tapering roots which diverge, apparently radially, from the base 

 of this trunk are identified as Stigmaria Evenii^ which name is engraA^ed on 

 the plate, although the figure is cited in the text as Sligmariopsis Evenii Lx. 

 The latter genus is used by Grand 'Eurj^ to designate the usually relatively 

 short, tapering roots at the base of Sigillarioid trunks, while the Stigmarics 

 are regarded by him as floating or submerged independent rhizomes capa- 

 ble of transfonnation and the development of Sigillarics whenever they 

 might encounter favorable conditions or the proper environment. 



Stigmaria Evenii Lx. is easil)^ distinguished from the other species 

 described from this country by its small scars quite irregularly and unevenly 

 arranged. 



Locality. — Mine at Deepwater, U. S. Nat. Mus., 6272. 



Stigjiarioid impression. 

 PI. LXX, Fig. 5. 



The fragment illustrated in PI. LXX, Fig. 5, is one of two specimens, 

 apparentl)^ impressions, to which the epidermis or a portion of the cortical 

 layers still adheres in the form of a thin carbonaceous residue. The surface, 



' G^ol. et pal. bassin liouill. Gard, 1890, Atlas, pi. xiii, ficr. 7B'. 



