central stele consists of pith, xylem and phloem. Surrounding
the small stem is a thick mantle of persistent leaf bases
and roots. When alive, the stem and mantle would have formed
an inverted cone-shaped structure that was topped with a
fronds (Tidwell, 1998, p. 187). The specimen
aged Osmunda from Australia.
W.D. (1998). Common Fossil Plants of Western North
America. [2nd Ed]. Washington: Smithsonian Institution