nomenclatorial act:
emend.
Bibliography:
Page:
209
diagnosis:
Cordaitean plants with mesarch xylem maturation of stem and leaf; primary xylem consisting of downward extensions of leaf traces; cauline bundles wanting. Leaves helically arranged with traces diverging from margin of pith as one or more bundles. Leaves strapshaped and assignable to Cordaites when found isolated. Cons axillary, compound, either single or paired; microsporangiate cones conforming to Gothania when isolated, at maturity containing monosaccate prepollen in the pollen sacs.
systematic position:
Cordaitales
typeseries:
Type: Mesoxylon sutcliffii Scott an Maslen
Classification:
Add new comment