nomenclatorial act:
protologue/first publication
Bibliography:
Page:
118
diagnosis:
Eustelic gymnosperms with fern-like leaves and leaf-borne reproductive organs. Cardiocarpalean ovules; microsporangia fused as a radial ring forming a synangium, dehiscence via a longitudinal slit on the inward-facing sporangial wall. Pollen saccate, with distal germination; microgametophyte forming an axial row of cells prior to sporangial dehiscence and a probable siphonogamous pollen tube at maturity. Pollination via pollination drop mechanism.
systematic position:
pteridosperms
typeseries:
Callistophytaceae
Classification:
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