Lesquereux also recorded Oligocarpia cf. gutbiert 
from Mazon Creek. White was doubtful of the accuracy 
of Lesquereux’s determination, but I do not share this 
doubt. I have seen six specimens referable to this species 
all from Braidwood and Mazon Creek. My concept of 
O. guthiert is based entirely upon the descriptions pub- 
lished in western Europe, although I have relied chiefly 
upon the opinions of Stur and Kidston. 
In summarizing, it is observed that only two un- 
doubted species of Oligocarpia occur in the Mazon Creek 
flora of Llinois: O. gutbiert Goeppert, and O.vera Darrah 
which is described in this paper. It is possible that O. ms- 
souriensis ID. White also occurs in this region, but the 
record is questionable. The record of O.alabamensis Les- 
quereux is erroneous. 
Oligocarpia vera is one of the pecopteroid species of 
Oligocarpia and is remarkable for its uniseriate annulus. 
The evidence regarding the systematic position of the 
genus is here reviewed and it is concluded that it belongs 
properly to the existing family Gleicheniaceae. 
[ 159 | 
