Plate XLI. FILICALES: CALLIPTERIDAE 



1-4. Callipteridium sullivanti (Lesquereux) Weiss. 



1, 4. From Mazon Creek, U I Coll. No. P 1311-12. 



2, 3. From Mazon Creek, U C Coll. No. 32061-2. 



100 



