80 FLORA OF LOWER COAL MEASURES OF MISSOLTRI. 



and pinnules can be gained from Fig. 5, PI. XXXV, represents a segment 

 of a spinous rachis 8 mm. in width, to which are attached three fertile pinnse, 

 the lower surface of wliicli is presented to the observer. The rachises of 

 these pinnae are provided with well-marked, distinct, upward-inclined, acute 

 spinous scales. 



The sporangia, a sketch of which is shown in Fig. 5a, are situated in a 

 row on each side of the midrib, the attachment being rather nearer the 

 margin. The sporangia, nearly 1 mm. long and about .2 mm. in width, 

 taperiaig to an acute apex, are apparent!}' arranged in fours and inclined 

 inward, so that when comjDressed they lie pointing more or less directly 

 toward the midrib, and covering the greater portion of the pinna. In most 

 cases the outer pair of sporangia are developed to a very much larger size 

 than the inner ones, the result being that in the flattened, carbonized mate- 

 rial thev only are seen. This condition is very similar to that illustrated in 

 Pecoptaris eimeura by Grrand 'Eiu-y^ and Zeiller.^ 



In the specimen before me the nervation is obscured by the sporangia, 

 except in the uppermost small pinnules, where the nervils are simple. This 

 character, together with the striking resemblance of the pinnae and pinnules 

 in form and arrangement to those illustrated by Zeiller in the flora of the 

 Commentry Basin,^ led me to aj^ply, though not without doubt, the same 

 name, Pecopteris liemitelioides Brongn., to the plant from Missouri. 



Locality. — Pitcher's coal bank, U. S. Nat. Mus., 5594. 



PECOPTERIS JEKNEYI 11. .sp. 



PL XXXVI, Figs. 1, 2. 



1897. Pecopteris sp., D. White, BulL GeoL Soc. Amer., voL viii, p. 296. 



Frond robust, dense; secondary (?) pinna? alternate, open, lanceolate 

 or linear-lanceolate, acute; rachis strong, rigid, irregularly striate and pro- 

 vided with narrowly lanceolate, acute, upward-curved, scaly spines, leav- ■ 

 ing, where broken away, rounded scars; ultimate pinnse alternate, open, 

 close, usually touching or slightly overlapping in the lower jjart of the 

 superior pinnae, often slightly curved upward, linear, the sides parallel in 



' Fl. caib. Loire, pi. vii, fig. 3. 



- Fl. foss. hoiiill. Comineutry, pi. xi, fig. 4a. 



^ Op. cit., pi. xi, figs. G, 6a, 7. 7a, p. 133. 



