Sciadopitys verticillata SIEBOLD et ZUCC., 1842

Hofmann, Christa-Ch., Odgerel, Nyamsambuu & Seyfullah, Leyla J., 2021, The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time, Fossil Imprint 77 (2), pp. 271-281 : 273

Sciadopitys verticillata SIEBOLD et ZUCC., 1842

Text-fig. 1a–i

D e s c r i p t i o n. Monad pollen of spheroidal to suboblate shape, elliptical to circular in polar view and elliptical in equatorial view; equatorial diameter 41.7 to 53.3 µm (LM, N = 11) and 24.4 to 37.1 µm (SEM, N = 5); polar diameter 35.5 to 43.3 µm (LM, N = 3) and 23.8 to 24.6 µm (SEM, N = 2); wall thickness in general using LM ranges from 2.3 to 3.3 µm (N = 1), using SEM 1.7 µm (N = 1; nexine ca. 0.6 µm and sexine ca. 1.1 µm); wall thickness at the leptoma was not measurable under LM and once under SEM: nexine 0.4 µm; sexine 0.3 to 0.7 µm (if present); sculpturing verrucate and occasionally slightly rugulate, perforate to foveolate with evenly spaced supratectal echini, rugulae and verrucae are not the result of a folding sexine; leptoma area either naked or unevenly covered by angular, partly echinate micro-verrucae.

R e m a r k s. The verrucae and rugulae are the smallest of here-investigated pollen.

Figures

Text-fig. 1. Extant Sciadopitys verticillata pollen. a–c: LM images (scale bars 10 µm), a – polar view, b – equatorial view, c – equatorial view with well visible thinning of proximal leptoma; d–e: SEM overview images (scale bar 10 µm), d – distal polar view, e – oblique equatorial view; f – equatorial view with leptoma at top; g–i: SEM detailed images (scale bars 2 µm), g – detail of verrucate, echinate, perforate sexine of distal pol, h – wall break displaying thin nexine and verrucate, echinate sexine, i – ripped open leptoma displaying transition from verrucate sculpturing to nearly psilate state.