Abstract
The description of Protoascon missouriensis is based on fossil ascosporic fungus with an ostiolate, perithecium-like fruiting body attached to a vesicular, appendiculate base. Ten or, rarely, 11 unbranched, septate appendages arise from the base, run parallel to each other and envelop the fruiting body. Protoascon resembles some species of Mycocarpon Hutchinson, another fossil fungus, in having a central body containing sporelike structures. The former fungus, however, neither possesses an ostiole nor anything comparable to an appendiculate base. Also, the wall of the fruiting body in Protoascon is apparently 1 cell thick, while it is 1–several cells thick in Myccea. pon. Protoascon was found in a coal ball of the Cabaniss formation, Cherokee group, Desmoinesian stage of the Middle Pennsylvanian system of Missouri, U.S.A.
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