Herrin Fossil Flora
Sphenopsids - Relatives of the Horsetails
Cones
Calamostachys tuberculata
Calamostachys tuberculata, (Page 3, Fig. 10. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - J.Vitosky
Macrostachya communis
C.Puritz
Macrostachya communis, (Page 3, Fig. 11. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - B. Riegler
M.Litt
L.Magnusson