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Titolo:
Lepingia: A new genus of probable cycadalean affinity with taeniopterid lamina from the Permian of South China
Autore:
Liu, LJ; Yao, ZQ;
Indirizzi:
Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Dept Palaeobot & Palynol, Nanjing 210008, Peoples R China Chinese Acad Sci Nanjing Peoples R China 210008 210008, Peoples R China
Titolo Testata:
INTERNATIONAL JOURNAL OF PLANT SCIENCES
fascicolo: 1, volume: 163, anno: 2002,
pagine: 175 - 183
SICI:
1058-5893(200201)163:1<175:LANGOP>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
GUIZHOU PROVINCE; GIGANTOPTERIDALES;
Keywords:
Lepingia emarginata; Taeniopteris; foliage of probable cycadalean affinity; epidermal structure; Permian; South China;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Liu, LJ Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Dept Palaeobot &Palynol, 39 E Beijing Rd, Nanjing 210008, Peoples R China Chinese Acad Sci39 E Beijing Rd Nanjing Peoples R China 210008 a
Citazione:
L.J. Liu e Z.Q. Yao, "Lepingia: A new genus of probable cycadalean affinity with taeniopterid lamina from the Permian of South China", INT J PL SC, 163(1), 2002, pp. 175-183

Abstract

Lepingia Liu et Yao, gen. nov., is created for the foliage of Taeniopteristype with amphistomatic cuticles from the early Late Permian deposits of South China. The type species Lepingia emarginata Liu et Yao, gen. et sp. nov., displays entire-margined lamina, an emarginate apex, once-bifurcated lateral veins, and amphistomatic cuticles. The adaxial cuticle is of moderatethickness, with haplocheilic stomata, which are rather sparsely distributed in the intercostal zones and are oriented irregularly. The abaxial cuticle is rather thin, with haplocheilic stomata that are densely distributed between the costal zones and are oriented at random. The guard cells of the abaxial cuticle are partly or fully concealed by the arching subsidiary cells resembling those in some species of the Mesozoic genus Nilsonia. Judging from the haplocheilic organization of stomata, relatively thin deposits of cuticle in guard cells, and irregular orientation of stomata, as well as rather straight anticlinal walls of epidermal cells, the new genus compares most favorably with the Mesozoic genera Doratophyllum and Nilsonia and most probably is of cycadalean affinity. Based on the cuticular characters, floral composition, taphonomic characteristics, and palaeomagnetic data, the ecology of the new taxon is briefly discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 07:43:40