Uskiella is a genus of small fossil plants of Early Devonian age (around 420 to 390 million years ago). The diagnostic characters are naked axes branching isotomously, terminating in ellipsoidal, vertically elongate flat sporangia which split longitudinally into two valves.[1] Spores of U. reticulata have a reticulate appearance.[2] Coalified specimens have been reported from Wales,[2] with a possible occurrence in Australia.[1]
The relationships of the genus are not clear because many anatomical details remain unknown. In 2004, Crane et al. published a cladogram for the polysporangiophytes in which Uskiella is basal to the lycophytes (clubmosses and relatives).[3]
Hao and Xue in 2013 listed the genus as a rhyniophyte.[4]
Referencesedit
^ abcShute, C.H. & Edwards, D. (1989), "A new rhyniopsid with novel sporangium organization from the Lower Devonian of Wales", Botanical Journal of the Linnean Society, 100 (2): 111–137, doi:10.1111/j.1095-8339.1989.tb01713.x
^ abFanning, U.; Edwards, D. & Richardson, J.B. (1992), "A diverse assemblage of early land plants from the Lower Devonian of the Welsh Borderland", Botanical Journal of the Linnean Society, 109 (2): 161–188, doi:10.1111/j.1095-8339.1992.tb00264.x
^Crane, P.R.; Herendeen, P. & Friis, E.M. (2004), "Fossils and plant phylogeny", American Journal of Botany, 91 (10): 1683–99, doi:10.3732/ajb.91.10.1683, PMID 21652317
^Hao, Shougang & Xue, Jinzhuang (2013), The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants, Beijing: Science Press, p. 329, ISBN978-7-03-036616-0, retrieved 2019-10-25
This article related to a Devonianplant is a stub. You can help Wikipedia by expanding it.
uskiella, genus, small, fossil, plants, early, devonian, around, million, years, diagnostic, characters, naked, axes, branching, isotomously, terminating, ellipsoidal, vertically, elongate, flat, sporangia, which, split, longitudinally, into, valves, spores, r. Uskiella is a genus of small fossil plants of Early Devonian age around 420 to 390 million years ago The diagnostic characters are naked axes branching isotomously terminating in ellipsoidal vertically elongate flat sporangia which split longitudinally into two valves 1 Spores of U reticulata have a reticulate appearance 2 Coalified specimens have been reported from Wales 2 with a possible occurrence in Australia 1 UskiellaTemporal range Early Devonian PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom Plantae Clade Tracheophytes Stem group Rhyniophytes Genus UskiellaShute amp D Edwards 1989 1 Species U spargens Shute amp D Edwards 1989 U reticulata Fanning et al 1992 The relationships of the genus are not clear because many anatomical details remain unknown In 2004 Crane et al published a cladogram for the polysporangiophytes in which Uskiella is basal to the lycophytes clubmosses and relatives 3 tracheophytes Rhyniaceae Huvenia Rhynia Stockmansella basal groups Aberlemnia caledonica Cooksonia caledonica Cooksonia pertoni basal groups Cooksonia cambrensis Renalia Sartilmania Uskiella Yunia lycophytes euphyllophytes Hao and Xue in 2013 listed the genus as a rhyniophyte 4 References edit a b c Shute C H amp Edwards D 1989 A new rhyniopsid with novel sporangium organization from the Lower Devonian of Wales Botanical Journal of the Linnean Society 100 2 111 137 doi 10 1111 j 1095 8339 1989 tb01713 x a b Fanning U Edwards D amp Richardson J B 1992 A diverse assemblage of early land plants from the Lower Devonian of the Welsh Borderland Botanical Journal of the Linnean Society 109 2 161 188 doi 10 1111 j 1095 8339 1992 tb00264 x Crane P R Herendeen P amp Friis E M 2004 Fossils and plant phylogeny American Journal of Botany 91 10 1683 99 doi 10 3732 ajb 91 10 1683 PMID 21652317 Hao Shougang amp Xue Jinzhuang 2013 The early Devonian Posongchong flora of Yunnan a contribution to an understanding of the evolution and early diversification of vascular plants Beijing Science Press p 329 ISBN 978 7 03 036616 0 retrieved 2019 10 25 nbsp This article related to a Devonian plant is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Uskiella amp oldid 1115929707, wikipedia, wiki, book, books, library,
