Redescription of some fossil gymnospermous pollen (Chasmatosporites, Marsupipollenites, Ovalipollis)

摘要

New morphological details of the monosulcoid form generaChasmatosporites, Marsupipollenites, andOvalipollisare given. Systematic descriptions include emendations ofChasmatosporites, Ovalipollis, and several species assigned to these genera. Possible phylogenetic relationships and paleobotanical affinities are discussed.