68 FLORA OF LOWER COAL MEASURES OF MISSOLTHL 



referred to this g-enus. I have seen specimens from Morris, Ilhnois, labeled 

 0. alabamensis, which should perhaps be included in this species. 



The clearest definition of the fruit dots that I am able to secure on this 

 specimen fails to give any conclusive proof of the generic identity of this 

 species, although the general asjoect and the position of the dots on the 

 pinnules are ^^ery similar to those shown by Geinitz^ or Schimper^ in 

 0. Gutbieri Goepp., except that ours are perhaps not so near the margin. 

 Under the lens the depressions and irregular disklike bodies within are 

 seen to strongly resemble those published in Stur's photograph of Oligo- 

 ■cmyia Beyriclii? 



The above description is based on tragments of sterile fronds or those 

 in which only a part is fertile. I have also referred, with doubt, to this 

 species several fertile fragments. The first of these, PI. XXI, Fig. 4, from 

 Pitcher's bank, shows a segment of a macerated pinna in which the out- 

 lines of the pinnules are in many instances quite uncertain, although the 

 position of the sporangia is well shown. .Here the circular depressions 

 :seem either to be vacant, except for a slight mammillate point in the center, 

 or to contain a flattened disk with thickened, rather irregular margin. When 

 viewed with a stronger lens this margin or rim seems to be bordered with 

 large, thick cells, thus appearing to present conditions resembling the fruit 

 of 0. Brongniartii as illustrated by Zeiller"' or Kidston.^ 



The specimen (No. 4468 of the Lacoe collection) illustrated in PI. 

 XXI, Fig. 2, seems also to belong to. Oligocarpia missouriensis. The same 

 form is also present at Mazon Creek, Illinois. But* of the identitj' of the 

 specimen illustrated in PL XXI, Fig. 1 (No. 4467 of the Lacoe collection), 

 I am not quite so sure, on account of the compactness of the pinnules, 

 although it seems to be comiected with the sterile forms tlu'ough the two 

 specimens just discussed. Both 4467 and 4468 show onl}' the upper sur- 

 face of the limb, so that only the inflations above the sporangia or sori are 

 seen. It will be noted that, while in most of the pinnules only two rows ot 

 fruit dots are seen, still, in the lobes of the lower and more pinnatifid pin- 

 nules additional dots make their appearance. It is hoped that this and other 



' Verst. Steink. Sacbseu, ]>. 17, pi. sxsiii, fig. 7. 



'^Trait<5, Atlas, pi. xU,fig. 8. 



•Fame A. Carbon-Flora, p. 137, pi. Ixiii, fig. 1. 



^ Fl. foss. houlU. Valeuciennes, p. 53, fig. 35. 



■'Trans. Geol. Soc. Glasgow, vol. is, 1889, pi. i, fig. 156. 



