112 FLORA OF LOWER COAL MEASURES OF MISSOURI. 



to it a new name, although the British specimen, which is in some respects 

 intermediate between it and the German type, is perhaps not more than 

 varietally different. 



The distinction between Aphlebia suhgoldenbergii and A. membranacea, 

 the only species with which it might be compared, has already been noted. 



Locality. — Clinton, Henry County, Missouri, No. 9599 of the Lacoe 

 collection, U. S. Nat. Mus. 



Afhlebia membranacea (Ls.). 



1S71I. RliiicuphyUum viemhranaceum Lesquereux, Coal Flora, Atlas, p. 10, pi. Iviii, figs. 

 1,2; text, vol. i (1880), p. 312. 



The species described as Rhacophyllum membranaceum by Lesquereux 

 is, as was remarked by its author,^ somewhat unique among the forms 

 included in that genus. The originals^ of the figures published in the Coal 

 Flora show an extremely delicate, transparent lamina, traversed by the 

 distinct, rather broad brown lines of the nervation. The nerves, which are 

 of varying width, are in some cases slightly fasciculate, one nervil passing 

 to the apex of each very oblique, acute lobule. One of the fragments of 

 this species recently obtained has a portion of the lateral divisions broken 

 away, so that the effect is very similar to the type RhacopliyUum tnmcatum 

 from the Upper Devonian of the Susquehanna Narrows, above Pittston, 

 Pennsylvania. 



Aphlebia membranacea is easily distinguished by its extremely delicate 

 texture and relatively slender nerves from all tlie associated species except 

 A. subgoldenbergii, which is much more Sphenopteroid, the lobules being 

 regularly pinnate and recurved and the nerves comparatively stronger. 



Localities. — Henry County, Missom-i, Nos. 9465 and 9466 of the Lacoe 

 collection, U. S. Nat. Mus.; Pitcher's coal mine, U. S. Nat. Mus., 5583. 



Aphlebia sp. 

 PI. XLV, Fig. 1. 



One among the fragments of Aplilebia from Missouri deserves special 

 mention. This specimen, a rather unsatisfactory photograph of which is 

 seen in Fig. 1, PI. XLV, comprises a segment of a rather coarsely and 



' Coal Flora, vol. i, p. 313. -Nos. 9465 and 9466 of the Lacoe collection. IT. S. Nat. Mns. 



