Bibliographic record
Pfefferkorn, H.W., R.A. Peppers, and T.L. Phillips, 1971.Some fern-like fructifications and their spores from the Mazon Creek compression flora of Illinois (Pennsylvanian). Illinois State Geological Survey Circular 463. Illinois State Geological Survey, Urbana, Illinois. 56 p.
Specimens figured in this publication:
15382,
15383,
15548,
15728,