Callistophyton
genus
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genus
Callistophytalean plants with ovule enclosed by integument except for the micropyle; ovules attached medially to lateral veins. Male: Pollen-bearing organs, consisting of 6-8 sporangia, attached to abaxial surface of unmodified pinnules; prepollen monosaccate of the Vesicaspora-type. Foliage: ronds bipartite, each branch tripinnately divided. Stems: eustelic with secretory system composed of spherical cavities lined with epithelium.
Lyginopteridopsid plants with bilateral symmetrical ovules, and with nucellus free from integument except in the basal one-fifth of the ovule; ovules noncupulate, borne on abaxial surface of unmodified pinnules; nucellar beak lacks a cellular plug or column. Male: Pollen-bearing organs consisting of 2-8 basally fused sporangia
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.