284 FLORA OF LOWER COAL MEASURES OF MISSOURI. 



to be vertically liiuited and to promise in many cases as great aid, within cer- 

 tain conditions, as distinct species. Thus, among the plants just mentioned, 

 the Pecopteris dentata from Henry County, Missouri, represents the robust 

 type, larger than the typical P.plumosa of the lowest of the Coal Measures, 

 yet not so flat and broad as the one found above the Waynesburg coal in 

 the Upper Barren or "Dunkard Creek series" (XVI) of Pennsylvania and 

 West Viro-inia. The form in hand is like that seen in the higher coals 

 of the Lower Productive Coal Measures. On the other hand, the small, 

 narrow form of Neuropteris Scheuchzeri and the more delicate AsterophyUUes 

 eqiiisetiformis found in the Missouri material are as yet unknown in any of 

 the coals above the Kittanniug group of the bituminous series of Pennsyl- 

 vania or the E coal of the anthracite region. 



So, too, the species which have not hitherto been found outside of the 

 Missouri terranes under consideration have but a subordinate coiTelative 

 value, based chiefly on analogies and inferences drawn from their relations 

 to other species. The species which, so far as I am aware, are, with refer- 

 ence to their American distribution, peculiar to the flora under discussion, 

 are given in the following list: 



Hysterites (Jordaiti.s. Twniopteris missouriensin. 



Eremopteris hilobata. Sphenoj^hylhimfasciculatum. 



Sphenopteris Broadheadi. Cychvladia Brittsii. 



S. misHOnriensis. Macrostachya longifolia. 



8. Van Ingeni. Sphenopliyllum Lescurianum. 



S. suspecta. Lepidodendron Brittsii. 



IS. capitata. L. lanceolatmn. 



S. ophioglossoides. ■ L. scutatum. 



S. hilobata. Lepidophloios Van Ingeni. 



Oligocarpia missouriensis. Lepidophyllum missouriense {Lepi- 



Pecopteris Jenneyi. dostrohus aud Lepidocy.stt.s mis- 



P. Glintoni. souriensis). 



P. mertensides. L- Jenneyi (Lepidostrobns Jennexji). 



P. pseudovestitu. Omphalophloios cyclostigma. 



Brittsia probleniatica. Lepidoxylon anomahm. 



Apliiebia membranacea. SigiUaria ovata. 



A. sithgoldenbergii. Cordaites communis. 



GaUipteridium membranaceum. Gordaicarpus cerasiformis. 



G. Jenneyi. Gardiocarpus Branneri.^ 



Neuropteris missouriensis. TitanophyUmn? Brittsii. 



Dictyopteris gillcersonensis. 



' This species is also found in the Coal Measures of Ai-kaiisas, though the report m which it is 

 described by Prof. H. L. Fairchild and myself for the State f,'eological survey is not yet publislied. 



