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.
systematic position:
Lyginopteridopsida, Callistophytales
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith