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Annals of Botany 72: 231-237, 1993
© 1993 Annals of Botany Company

Spatial Distribution and Reproductive Behaviour of a Triploid Braken (Pteridium aquilinum) Clone in Britain

E. Sheffield, P. G. Wolf, F. J. Rumsey, D. J. Robson, T. A. Ranker and S. M. Challinor

School of Biological Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK; Department of Biology, Utah State University, Logan, Utah 84322 and University Museum, Campus Box 350, University of Colorado, Boulder, Colorado 80309, USA

Chromosome counts of 156 in root tip cells of a bracken plant growing in a natural British population confirm the first record of a triploid in this species. Spore and stomatal measurements support the contention of earlier work that cell size in correlated with ploidy level in ferns, but the plant is unusual in comparison with other odd-numbered polyploids in its degree in its of fertility ('good' spore and functional gametophyte production). Two-dimensional mapping based on isozyme electrophoresis reveal substantial spatial dimensions for the triploid, indicating a plant of considerable antiquity.Copyright 1993, 1999 Academic Press

Pteridium aquilinum, bracken, triploid, clone, reproduction, spatial distribution, genetics


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