Pteridophytes - Ferns
are vascular plants (plants with xylem and phloem) that produce neither
flowers nor seeds, and are hence called vascular cryptogams. Instead,
they reproduce and disperse only via spores.
studies of the land plants agree that all the pteridophytes share a
single common ancestor. However, they are not a clade (monophyletic
group) because the seed plants are also descended from within this
group—probably close relatives of the progymnosperms.
To see or
download the bibliography of Prof. Dr Jan Kornaś and Prof. Dr
Medwecka – Kornaś, who did a lot of research on Pteridophyta click here
For Ferns in
Zambia see website: Flora of Zambia