Venation pattern in the sphenophyll Trizygia speciosa Royle from the Raniganj Formation

Authors

  • H.K. Maheshwari Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
  • V.K. Singh Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
  • Usha Bajpai Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.1988.1596

Keywords:

Sphenopsida, Trizygia, Venation pattern, Sphenophyllum, Raniganj Formation

Abstract

There has been a running controversy about the independent taxonomic status of the genus Trizygia vis-a·vis Sphenophyllum. The basic organization of the foliage shoot in both genera is apparently similar, except for the trizygoid leaf whorls in the former. The trizygoid leaf whorls are, however, not unknown in Sphenophyllum. The two genera cannot be compared at the level of the anatomy of the axes or the organization of the fertile shoot as this information is not available for Trizygia. The venation pattern in leaves of Trizygia has been analysed in detail with a view to comparing it with that of Sphenophyllum, when that information is forthcoming. The parameters chosen for analysis include length, width and area-index of leaves and number of dichotomies, ultimates and dichotomy levels.

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References

Asama K 1966. Two types of evolution in Sphenophyllum. Bull. natn. Sci. Mus. Tokyo 9: 37-607.

Asama K 1970. Evolution and classification of Sphenophyllales in Cathaysia Land. Bull. natn. Sci. Mus. Tokyo 13(2): 291-317.

Brongniart A 1828. Prodrome d'une bistoire des vegetaux fossiles, Paris.

Feistmantel O 1880. The fossil flora of the Lower Gondwana-2. The flora of the Damuda and Panchet divisions. Mem. geol. Surv. India Palaeont. indica, ser. 12, 3(3): 1-77.

Germar EF & Kaulfuss F 1831. Uber einige merkwurdige Pflanzehabdrucke aus der steinkohlenformation. Nova Acta Leopoldina 15(2): 219-230.

Koenig, C. 1825. Icones fossilum sectiles, London.

McClelland J 1850. General remarks, II. Geognosy: III. Description of plates and collections, pp. 52-57 in: Report of the Geological Survey of India, for the Season 1848-49, Military Orphan Press, Calcutta.

Maithy PK 1976. Further observations on Indian Lower Gondwana Sphenophyllales. Palaeobotanist, 25: 266-278.

Pant DD & Mehra B 1963. On the epidermal structure of Sphenophyllum speciosum (Royle) Zeiller. Palaeontographica, B112: 51-57.

Royle JF 1833-1839. Illustrations of the botany and other branches of natural history of the Himalayan mountains and the flora of Casbmere, London.

Unger F 1850. Genera et species plantarum fossilium, Vindo bone.

Voss EG et. al. 1983. International Code of Botanical Nomenclature, Utrecht: 425.

Yabe H 1922. Notes on some Mesozoic plants from Japan, Korea and China in the collection of the Institute of Geology and Palaeontology, Tohoku Imperial University, Toboku Univ., Sci. Rep., 2nd Ser., 7(1):1-28.

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Published

1988-12-31

How to Cite

Maheshwari, H., Singh, V., & Bajpai, U. (1988). Venation pattern in the sphenophyll Trizygia speciosa Royle from the Raniganj Formation. Journal of Palaeosciences, 37((1-3), 26–35. https://doi.org/10.54991/jop.1988.1596

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