Celatheca is a genus of extinct plants of the Early Devonian (Pragian, around 410 million years ago). Fossils were first found in the Posongchong Formation of eastern Yunnan, China. The leafless stems (axes) divided dichotomously but unequally so that one branch formed more of a 'main' stem and the other a side branch system. Side branches which did not bear spore-forming organs or sporangia divided two or three times further, ending in tips which curled back on themselves. Side branches bearing sporangia ultimately divided to produce a group of four sporangia, each with an outer leaf-like bract which folded around the sporangium. Celatheca resembles the Australian fossil Yarravia.[1]
^ abcHao, Shougang & Gensel, Patricia G. (1995), "A New Genus and Species, Celatheca beckii, from the Siegenian (Early Devonian) of Southeastern Yunnan, China", International Journal of Plant Sciences, 156 (6): 896–909, doi:10.1086/297312, JSTOR 2475120, S2CID 86664097
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celatheca, genus, extinct, plants, early, devonian, pragian, around, million, years, fossils, were, first, found, posongchong, formation, eastern, yunnan, china, leafless, stems, axes, divided, dichotomously, unequally, that, branch, formed, more, main, stem, . Celatheca is a genus of extinct plants of the Early Devonian Pragian around 410 million years ago Fossils were first found in the Posongchong Formation of eastern Yunnan China The leafless stems axes divided dichotomously but unequally so that one branch formed more of a main stem and the other a side branch system Side branches which did not bear spore forming organs or sporangia divided two or three times further ending in tips which curled back on themselves Side branches bearing sporangia ultimately divided to produce a group of four sporangia each with an outer leaf like bract which folded around the sporangium Celatheca resembles the Australian fossil Yarravia 1 CelathecaTemporal range Early Devonian PreꞒ Ꞓ O S D C P T J K Pg NScientific classificationKingdom PlantaeClade TracheophytesStem group RhyniophytesForm taxon CooksonioideaGenus CelathecaS G Hao amp Gensel 1995 1 SpeciesC beckii S G Hao amp Gensel 1995 1 References edit a b c Hao Shougang amp Gensel Patricia G 1995 A New Genus and Species Celatheca beckii from the Siegenian Early Devonian of Southeastern Yunnan China International Journal of Plant Sciences 156 6 896 909 doi 10 1086 297312 JSTOR 2475120 S2CID 86664097 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 Celatheca amp oldid 1115931513, wikipedia, wiki, book, books, library,
