path. Sori large, placed at the ends of the veins, on the 
lower surface of the frond. Sporangia 4 to 6 in number, 
independent, placed in a ring. Sporangia annulate with 
the annulus composed of one row of cells. Sporangia 
35-45 mm. long, 20 mm. wide. Spores numerous (hun- 
dreds), subspherical, smooth, 35-40 ». in diameter. 
Ho.toryre No. 18704 F.O. Thompson Collection in 
the Botanical Museum of Harvard University. 
This new species is clearly referable to the group of 
Oligocarpia guthiert, but is readily distinguished by hav- 
ing a uniseriate annulus and by having robust pecopter- 
oid foliage. 
Oligocarpia vera is distinguished from O.kansasensis 
Sellards’ by its greater size, its pecopteroid rather than 
sphenopteroid foliage, its smooth rather than punctate 
rachis, its absence of ‘‘thorns’’ on the rachis, and in not 
having the tertiary pinnules overlapping. In O.kansas- 
ensis the details of the sorus are not known. The Kansas 
species occurs in the Lawrence Shales, Douglas Forma- 
tion. 
Oligocarpia vera differs trom O.alabamensis Lesquer- 
eux in having well developed termina! pinnules, pecop- 
teroid instead of sphenopteroid foliage,and more flexuous 
venation. It differs also from O.missouriensis D.White* 
in having pecopteroid foliage, much greater size, pin- 
nules which are not crenulate and do not depart at right 
angles from the rachis of the pinna. In O.missouriensis 
the details of the sori and sporangia are not known. 
Oligocarpia flagellaris Lesquereux’ has sphenopter- 
oid foliage and perhaps should be excluded from this 
genus. Specimen No. 7596 from Morris, Llinois (Les- 
quereux’s No. P.294) is a Sphenopteris and the fructi- 
fication is indistinct. O.vera bears no relationship to this 
species. 
It now appears to be clear that the foliage of Oligo- 
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