Abstract
Nyssidium jiayinense, a new species of the extinct genus Nyssidium, Cercidiphyllaceae, is described from the Palaeocene of north-east China. The infructescences of the fossil are paniculate with 14–22 follicles in individual racemose branches. The follicles occur in pairs with opposite ventral sutures. The follicle wall is three-layered, with a thin epidermis. Mesocarp fibres are longitudinal and endocarp fibres transverse. The distinct features of the infructescence structure differ from all other fossil Cercidiphyllum -like plants and living Cercidiphyllum. The fossil provides new morphological evidence supporting the hypothesis that the follicle clusters in extant Cercidiphyllum evolved by reduction from an elongated inflorescence.
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