Board 21 EVALUATION OF EXINE
COAT OF HERBACEOUS POLLEN GRAINS BY MEANS OF SCANNING ELECTRON MICROSCOPY.
After exocytosis the pro-orbicules nest on the tapetal plasmalemma and get a sporopollenin coat synchronously with the developing pollen exine
(Christensen et al.
The reason of the total absence of Urtica pollen in all samples is probably the quick disintegration of the pollen of delicate exine
and partly maybe its poor visibility in soil samples.
5 mm appendages adnate to the petals for 8-12 mm; stamens completely exposed at anthesis, erect; filaments terete, white, the antesepalous ones free, the antepetalous ones shortly adnate to the petals; anthers linear, 8-10 mm long, filiform at anthesis, fixed near the base, distinctly shorter than the petals; pollen narrowly ellipsoid, sulcate, exine
broadly reticulate, lumina subrounded, muri narrowed; style slightly shorter than the petals, white; stigma conduplicate-spreading, blades slightly contorted with recurved apices, densely papillose, white, ca.
The spores of Cibotium show varying degrees of exine
distal ridge development (Gastony, 1982).
Anderson Bailey, a retired UO music professor and one of the first soloists to perform with the Oregon Bach Festival.
The pollen grain exine
and shape were visualized under light microscope Nicon Eclipse E600.
The pollen morphology of the fossil is also consistent with Rhamnaceae: tricolporate pollen with rugulate to striate-rugulate exine
is present in Ziziphus (Nasri-Ayachi & Nabli, 1995), Paliurus (Schirarend, 1996), Hovenia (Zhang & Chen, 1992), and Sageretia (Perveen & Qaiser, 2005); but not in Rhamnus, Frungula (Punt et al.
Hohenbergia capitata also shares the same pollen morphology with many other species of Hohenbergia, in which the pollen grains are usually diporate or sometimes 3 to 6-porate, with exine
often psilate, sharply contrasting with the typical pollen grains of the members of the "Gravisia complex", which are distinctly pantoporate, usually bearing over 8 pores distributed more or less regularly over the whole surface, with a broadly reticulate exine
patterns, shape, size and the dimensions of pollen grains for each jujube cultivar were determined by using a scanning electron micrograph (SEM).
The three families differ from Apiineae in several structural features, including the lack of schizogenous secretory canals (see Plunkett & Lowry, 2001) and their pollen exine
texturing, which is usually reticulate in most Apiineae but varies in the three remaining families (Karehed, 2003).
Frohnmayer received her bachelor's degree in music from the UO in 1960, studying voice with Exine
Bailey and piano with George Hopkins.