On the cuticle of Dicroidium (Thinnfeldia) sahnii (Seward) with some observations on the genera Thinnfeldia and Dicroidium

Rao, A. R.; Lele, K.M.

doi:10.54991/jop.1962.614

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Also in D. hughesii some of the cells are papillate and stomata are more on one surface. D. sahnii (Seward) Rao & Lele (1962) is distinguished from the present species by the presence of papillate cells and also in having fewer number of subsidiary cells. D. nidpurensis comes closer to D. obtusifolium (Johnston) Townrow (1966) in having mostly smooth walled cells, but the latter species differs from the former in having only 4 subsidiary cells but usually one or both lateral subsidiary cells are divided radially.…”

Section: Introductionmentioning

confidence: 63%

“…4-5. Besides these species, D. papillosum also resembles to some extent D. narrabeenensis Walkom (1925) described by Jacob & Jacob (1950), D. sup.erb.um (Shirley) Tcwnrow (1957), D. conactum (Johnston) Townrow (1957), D. hughesii (Feistmantel) Townrow (1957) described by Lele (1961) and D. sahnii (Seward) Rao & Lele (1962) in having papillatt:< cells. But in all the latter mentioned species papillae are rather rare.…”

Section: Holotype -No 33952mentioning

confidence: 86%

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The Genus Dicroidium from the Triassic of Nidpur, Madhya Pradesh, India

Bose¹,

Srivastava²

1970

JPS

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Three new species of Dicroidium are desc1'ibed here from the Triassic of Nidpur, Sidhi District, Madhya Pradesh. Externally these three species are very similar to each other except that in D. nidpurensis and D. papillosum the venation is odontopteroid type, whereas, in D. gopadensis it is alethopteroid type. In the cuticular structure these species differ from each other main Iv in the presence or absence of papillae. In D. nidpurensis cell surface is smooth but in D. papillosum and D. gopadensis surface wall is usually papillate. In D. papillosum, subsidiary cells may be unspecialized or papillate, whereas, in D. gopadensis they are usually papillate.

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Section: Introductionmentioning

confidence: 63%

Section: Holotype -No 33952mentioning

confidence: 86%

The Genus Dicroidium from the Triassic of Nidpur, Madhya Pradesh, India

Bose¹,

Srivastava²

1970

JPS

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“…1, figs 1, 2, 4-7; text-figs 2 A, B; 3 A-C; 4 A-C) as D. odontopteroides have been assigned to D. zuberi with respect to the shape of lamina segments, venation pattern and epidermal features. Specimens of D. sahni described by Rao and Lele (1963) and those of Dicroidium sp. cf.…”

Section: Methodsmentioning

confidence: 99%

Reappraisal of the genus Dicroidium Gothan from the Triassic sediments of India

Pal

Ghosh²,

Kar³

et al. 2014

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The genus Dicroidium Gothan, belonging to Corystospermaceae, is characterised by pinnately compound leaves with proximally forked primary rachis. The genus was earlier included under the genus Thinnfeldia Ettingshausen. Dicroidium is the most consistent macrofloral element in the Triassic strata of Southern Hemisphere. The present reassessment deals with the morphotaxonomy and stratigraphic significance of the species of Dicroidium in India. A critical review of the literature reveals that the specimens of Dicroidium described so far from India require reassessment, because same morphotypes have often been placed under different species names and sometimes dissimilar elements have been assigned to the same species. In view of this, a thorough analysis of Indian Dicroidium was undertaken based on fresh collections along with the species described earlier by previous workers. The present reappraisal reveals that the genus in the Triassic of Peninsular India is represented by eight species. These are D. hughesii (Feistmantel) Lele, D. zuberi (Szajnocha) Archangelsky, Dicroidium sp. cf. D. crassinervis (Geintz) Anderson & Anderson, D. townrovii Retallack, D. nidpurensis Bose & Srivastava, D. gopadensis Bose & Srivastava, D. giarensis Pal and Dicroidium sp. In Indian peninsula, appearance of Dicroidium heralds the onset of Triassic sediments belonging to the early Triassic Panchet Formation (Induan). In the younger sequence of Triassic, i.e. during late Triassic Tiki and Parsora formations (Carnian to Norian–Rhaetian), the diversity and species richness of the genus gradually enhanced and Dicroidium foliages became the most predominant component of Triassic macroflora of India. The genus does not occur in strata younger than the Triassic and thereby the total extinction of Dicroidium signifies the end of the Triassic Period.

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“…The genus becomes a common element of fossil assemblages in Spathian strata (RETALLACK 1977;HOLMES & ASH 1979) and dominates floras in succeeding strata up to theend-Triassic extinction horizon (BALME et al 1995). Dicroidium has its centre of distribution in the middle and high palaeolatitudes of Gondwana, with particularly large collections described from the Middle to Upper Triassic of South Africa (DU TOIT 1927;THOMAS 1933;ANDERSON & ANDERSON 1983), South America (FRENGUELLI 1943(FRENGUELLI , 1944bBORTOLUZZI & BARBERENA 1967;ARCHANGELSKY 1968;PETRIELLA 1981;GUERRA-SOMMER & CAZZULO KLEPZIG 2000), Antarctica (TOWNROW 1967;BOUCHER et al 1993;BOMFLEUR & KERP 2010;ESCAPA et al 2011;BOMFLEUR et al 2012), India (e.g., FEISTMANTEL 1879aPAL et al 2014;RAO & LELE 1962;SEWARD 1932), Australia (e.g., WALKOM 1917, 1925a, 1928JONES & DE JERSEY 1947;TOWNROW 1957;HOLMES & ANDERSON 2005;PATTEMORE 2016), and New Zealand (e.g., ARBER 1913RETALLACK 1980b).…”

Section: [Full Column Table 1]mentioning

confidence: 99%

Mummified Dicroidium (Umkomasiales) leaves and reproductive organs from the Upper Triassic of South Australia

Unverfärth¹,

McLoughlin²,

Bomfleur³

2022

palb

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The Leigh Creek Coal Measures incorporate unusually low-rank coals from the Upper Triassic of South Australia. Associated fluvio-lacustrine deposits contain well-preserved, partly mummified plant remains dominated by corystosperm seed ferns. The assemblage comprises seven species of Dicroidium, including D. odontopteroides, D. lineatum, D. dubium, D. zuberi, and Dicroidium spp. A, B and C, and associated reproductive organs, including various fragments of cupulate structures (Umkomasia sp. cf. U. quadripartita and Fanerotheca sp. cf. F. waldeckiformis) and pollen organs (Pteruchus africanus), all having excellent cuticle preservation. Based on a comprehensive analysis of more than 550 individual specimens, we (1) document diagnostic epidermal and cuticular features for foliage and reproductive organs, (2) provide an identification key for the Dicroidium species present, and (3) infer affiliations between reproductive organs and particular leaf species based on correspondence in epidermal anatomy and cuticle micromorphology and on mutual-occurrence data. Collectively, the Leigh Creek material contributes towards a more robust and realistic systematic classification of Umkomasiaceae, offers a rare chance for whole-plant reassembly of individual species, and refines reconstruction of the Dicroidiumdominated forest ecosystems in the middle to high latitudes of the Late Triassic greenhouse world.

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On the cuticle of Dicroidium (Thinnfeldia) sahnii (Seward) with some observations on the genera Thinnfeldia and Dicroidium

Cited by 4 publications

References 2 publications

The Genus Dicroidium from the Triassic of Nidpur, Madhya Pradesh, India

The Genus Dicroidium from the Triassic of Nidpur, Madhya Pradesh, India

Reappraisal of the genus Dicroidium Gothan from the Triassic sediments of India

Mummified Dicroidium (Umkomasiales) leaves and reproductive organs from the Upper Triassic of South Australia

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