Krassilovianthus gen. nov., a new staminate inflorescence with ...

6 N.P. Maslova et al. / Review of Palaeobotany and Palynology 180 (2012) 1–14
Plate IV. Krassilovianthus sarbaensis gen. et sp. nov., specimen no. 417/102, SEM.
1. Fragment of the surface of pollen sac apex, epidermis is removed to show cells of endothecium.
2. Fragment of preserved epidermis of pollen sac apex; finely striate cuticle and stoma seen.
3. Stomata in epidermis of pollen sac apex, smaller specialized subsidiary cells forming a ring with transverse cuticle folds.
4, 5. Stomata in epidermis of pollen sac apex.
6. Epidermis of pollen sac apex, square ordinary cells and trichomes with broken apices.
narrowly spindle-shaped with parallel margins and slightly pointed tips.
They are free along the most their length, but often confluent in the
basal part. Occasionally, the pollen sacs vary in size within the
anther (Plate III, 5–10). The connective is indistinguishable. Transverse
sections show no connective tissue between the thecae along the
whole length of the stamen. During the androecium maceration, no
other cuticles, besides those of the pollen sac, were found. In transverse
sections, the outlines of the pollen sacs vary from rounded (Plate VI, 6)
to oval (Plate V, 3–6; Plate VI, 3, 4) and triangular (Plate V, 3,4).The
cuticle of the pollen sacs is finely striate; the folds are parallel to the