On the structure of Buriadia heterophylla (Feistmantel) Seward &amp; Sahni and its fructification

Pant, D.D.; Nautiyal, D.D.

Unranked:

Buriadia heterophylla

Buriadia heterophylla Seward and Sahni emend. Serbet et al

nomenclatorial act:

emend.

Bibliography:

Additional observations on the enigmatic Permian plant Buriadia and implications on early coniferophyte evolution

Page:

169

diagnosis:

compressions of shoots of two kinds bearing helically arranged simple to multifid leaves; shoots without ovules with densely packed acute-to-round-tipped bifid leaves occasionally appearing in whorls. Leaves with abaxial elongate epidermal cells and adaxial papillae. Leaf margin with small inconspicuous trichomes. Ovule bearing shoots with simple, bifid, and multifid leaves. Simple rounded leaves subtending orthotropous ovules with 180° rotational symmetry. Ovule with prominent apical integumentary extensions, longitudinally oriented striations, and a prominent basal disk.

systematic position:

Coniferophyta, Buriadia

Buriadia heterophylla Seward and Sahni

nomenclatorial act:

emend.

Bibliography:

Reinvestigation of the coniferophyte morphospecies Buriadia heterophylla Seward and Sahni, with reinterpretation of vegetative diversity and putative seed attachments

Page:

diagnosis:

Morphotaxon of woody coniferophyte vegetative shoots with irregular branching, bearing helically arranged polymorphic, simple, bifid and multifid leaves. Leaves closely arranged on ultimate and penultimate branches , more distantly spaced on antipenultimate branches and absent from largest stems. Stem surface rugose with thick cuticle and round to tangentially oriented oval branch scars, longitudinally disposed subtle wavy ridges on apparently decorticated stem surfaces.

systematic position:

As a result of the discoveries that (1) all of the presently known material of Buriadia (including specimens described as Birsinghia florinii) conform to a single range of structural variation, and (2) none of the horned seeds associated with any of the specimens described as Buriadia heterophylla or Birsinghia jlorinii are attached to the leafy shoots, we now realize that there is no evidence for the reproductive structures of this species. Therefore, following the International Code of Botanical Nomenclature (Greuter et al., 2000), Buriadia heterophylla is a morphotaxon of vegetative coniferophyte remains.

typeseries:

Lectotype: Small leafy shoot designated as the lectotype of Buriadia heterophylla by Florin (1945, p. 311) for a specimen illustrated by Feistmantel (1879-1881 , PI. XXIII, fig. 4). That specimen (No. 5/45 from the Karharbari beds at Buriadi) is housed at the Geological Survey of India, Calcutta, and also has been figured by Seward and Sahni (1920, PI. 11, fig. 20). Not realizing that Florin (1945) had formally lectotypified Buriadia heterophylla, Pant and Nautiyal (1967) later chose a larger branched specimen (i.e. specimen no. 5/43=5043, also housed at the Geological Survey of India, Calcutta) to lectotypify the species. Three different versions of that specimen have been illustrated previously. It was first illustrated by a drawing in Feistmantel (1879-1881, PI. XXIII, fig. 2; our Plate V, 1). A photograph of the 'partly restored ' specimen was figured by Sahni (1928, PI. I, fig. 1; our Plate V, 3), and a second drawing of the 'partly restored ' specimen was presented by Pant and Nautiyal (1967, figure 79A; our Plate V, 2). In this paper we follow Florin's earlier lectotypification of the species B. heterophylla.

On the structure of Buriadia heterophylla (Feistmantel) Seward & Sahni and its fructification

D. D. Pant and Nautiyal, D. D., “On the structure of Buriadia heterophylla (Feistmantel) Seward & Sahni and its fructification”, Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, vol. 252, pp. 27-48, 1967.

Buriadia heterophylla Seward et Sahni

nomenclatorial act:

emend.

Bibliography:

Die Koniferen des Oberkarbons und des Unteren Perms. Fünftes Heft

Page:

311

diagnosis:

Holzgewächse. Laterale Sproßsysteme beblättert, unregelmäßig (nicht fiederartig) verzweigt, bis wenigstens 3 dm lang, mit kräftiger, bis 1,4 cm dicker, an der Oberfläche gefelderter Achse vorletzter Ordnung und wenigen, zerstreuten, nicht-parallelen, abwechselnden oder fast opponierten, in etwa einer Ebene ausgebreiteten, abstehenden bis gespreizten (30-90°) Seitenzweigen auf großer und wechselnder Entfernung voneinander. Blattpolster am oberen Ende mit einer rundlichen Blattnarbe.

typeseries:

"Typus: das Original zu Seward & Sahni 1920, Taf. II, Abb. 20" "(Mus. Geol. Surv. India in Calcutta, nicht gesehen)"

Early Conifers

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Genera and species

Buriadia heterophylla

Buriadia heterophylla Seward and Sahni emend. Serbet et al

Buriadia heterophylla Seward and Sahni

On the structure of Buriadia heterophylla (Feistmantel) Seward & Sahni and its fructification

Buriadia heterophylla Seward et Sahni

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Genera and species

Buriadia heterophylla