Abstract
This study describes Homevaleia gouldii H. Nishida, Pigg, Kudo et Rigby gen. et sp. nov., an ovule-bearing glossopterid organ, based on a combination of recently collected permineralized specimens from the Late Permian Homevale Station locality in the Bowen Basin of Queensland, Australia, and on previously studied material from the 1977 Gould and Delevoryas study. Homevaleia, which resembles the compression–impression genus Dictyopteridium, is an inrolled megasporophyll with a distinct keel that bears numerous (over 70) stalked ovules on its adaxial surface. Ovules are small, oval, with an elaborate mesh-like structure that is developed from the outermost integumentary layers. Specimens interpreted as representing different developmental stages show there is an apparent interrelationship between megagametophyte development and the opening of the surrounding fertile structure for pollination. Together, new information provided by this material enables better understanding of glossopterid reproductive structure and its function in one distinctive form.
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Acknowledgments
We thank Robert Jones, The Australian Museum, Sydney, Australia, for providing access to the Gould and Delevoryas specimens from Homevale, and Melanie L. DeVore, Georgia State College & University, Milledgeville, GA, USA, for reading a draft of the manuscript. The field collection at Homevale was supported by Grants for Overseas Survey No. 04041034 from the Ministry of Education, Culture, Sports, Science and Technology of Japan to Professor Masahiro Kato, University of Tokyo (now at National Science Museum), and No. 08041135 to Dr Motomi Ito, University of Tokyo, to whom we are deeply grateful. This study was supported in part by Grant-in-Aid for Scientific Research No. 07640933 from the Ministry of Education, Culture, Sports, Science and Technology of Japan to H.N. and by National Science Foundation Grant BSR-9006625, and an Arizona State University Faculty Grant-in-Aid to K.B.P.
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Nishida, H., Pigg, K.B., Kudo, K. et al. New evidence of reproductive organs of Glossopteris based on permineralized fossils from Queensland, Australia. I. Ovulate organ Homevaleia gen. nov.. J Plant Res 120, 539–549 (2007). https://doi.org/10.1007/s10265-007-0093-0
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DOI: https://doi.org/10.1007/s10265-007-0093-0