A New American Species of Bowmanites

Abstract

A well-preserved cone, B. bifurcatus, descr. from the McLeansboro group (upper Penn-sylvanian) of Berryville, Illinois. The small, homosporous cone is about 3 mm. in diam., and consists of 17 whorls of appendages. Each whorl consists of 6 bracts, above which are borne 6 pairs of sporangia, each attached at its distal end to a recurved forking sporangiophore. The vascular system of the axis is a small triarch structure. The epidermal cell walls of the bracts are strongly sinuous, and those of the sporangia slightly so. The spores are monolete and smooth-walled.