In a flowering frond, a distinct elliptical furrow was observed
on the dorsal surface exposing the floral organs (Fig. 3), usually to
one side of the median antero-posterior axis. As an initial step of
flowering, primordia of stamen and pistil (which might represent a
reduced form of male and female flowers, respectively, of an inflorescence)
develop at the posterior and anterior side, respectively,
in the floral cavity formed at an eccentric position. Developing primordia
inside the frond give rise to the appearance of mounds on
the dorsal surface. A furrow on the dorsal surface which exposes
these immaturefloral organs (Fig. 3a and b) soondevelops into a circular
rim-like protuberance which grows over the developing floral
organs arching them completely and covering the original opening
(Fig. 3c). The stigma of the female floral organ which matures first
pushes apart the marginal flaps of the furrow and widens it (Fig. 3d
and e) emerging to the exterior (Fig. 4a), the stamen soon takes
over and the anther lobes become prominent on the dorsal surface
of a flowering frond (Fig. 4b–d). The stigma of a mature female floral
organ produces an exudate which is placed like a droplet on its
funnel shaped upper surface (Fig. 4e). Upon maturity, the bi-lobed
anther dehisces (Fig. 4d and f) releasing the pollen grains (Fig. 4g)
which are attracted by the stigma.Agroup ofW. microscopica fronds
in a flowering state is a very frequent view (Fig. 4d). The formation
of organs of perennation, turions, could not be observed in
this species, neither in nature nor during cultivation under various
controlled conditions.