Abstract
Ellipsoid lagenostomalean ovules previously regarded as Conostoma oblongum are recognized as a distinct species based on shape, number of vascular bundles, and histological features of the integument. Conostoma williamsonii n. sp. is shorter and broader than C. oblongum and possesses a larger number (eight or nine) of vascular bundles. Features of the integument are similar to those of C. oblongum and C. chappellicum and include a smooth outer margin and a two-zoned sclerotesta. Conostoma williamsonii increases our understanding of the diversity of lagenostomalean ovules during the Middle Pennsylvanian and calls to question the occurrence of C. oblongum in currently known North American coal-ball floras.
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