psilate

psilate

[′sī‚lāt]
(botany)
Lacking ornamentation; generally applied to pollen.
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The pollen grains were reported as trizonocolporate (tricolporate), prolate spheroidal, oval in meridional view, 25-50 microns in size and with lalongate ora (pores) and a surface patterning ranging from obscure - psilate - striate - rugulose.
The pollen of Mutisieae and Stifftieae is microechinate, echinate, or almost psilate in some members of Mutisieae; the exine is distinctly bilayered but commonly with a compact ectosexine constituted by columellae very thickly disposed and an endosexine with columellae clearly distinguishable, stout and ramified (Hansen, 1991b; Telleria et al.
5 mm long, dorsifixed near the base, base sagittate, apex acute; Pollen ellipsoid, sulcate, psilate or inconspicuously brochate; Style surpassing the anthers; Stigma simple erect, white, blades spatulate, erect, ca.
Pollen subprolate to prolate, large size, tricolporate, exine Mutisia type, microechinate or almost psilate (see also Parra & Marticorena, 1972).
12 mm long, dorsifixed slightly above the middle, base sagittate, apex subacute and apiculate; pollen broadly oblong-ellipsoid, apparently sulcate, exine psilate to microreticulate; stigma conduplicate-spiral, cylindrical, ca.
Tricolporate, colpi long with psilate membrane, mesoaperturate.
In the following discussion, echinate means having surface spines of at least 1 [micro]m in height, regardless of whether there are surface ridges or not; the alternative, psilate, means without surface spines of at least 1 [micro]m in height (a distinction traditionally applied because such grains appear effectively smooth under LM).
Monads, tetrads, and polyads are observed; the pollen size ranges from very small to medium (rarely large); and the tectum is perforate, (micro)reticulate, foveolate, psilate, or rugulate.
latter has aspis structure in the pore area and has psilate or
slits; pollen monosulcate, proximal sculpturing psilate to foveolate.