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The Fern Gazette Volume 18 Part 3

Published 27th August 2008


Edited by M. Gibby & A. Leonard


MAIN ARTICLES

The cytotaxonomy of the Asplenium stuhlmannii complex (Aspleniaceae: Pteridophyta) in Africa
A. F. Braithwaite pg(s) 81-90
ABSTRACT
A new octoploid species, Asplenium mantoniae, intermediate between two tetraploids species, A. stuhlmannii and A. jaundeense, is described from West Africa. The morphology and distribution of members of the complex are consistent with the view that the octoploid has probably arisen by hybridization of the two tetraploids and chromosome duplication.
Asplenium delavayi (Aspleniaceae: Pteridophyta) – A fern species new to Nepal
A. Rijal pg(s) 91-97
ABSTRACT
Asplenium delavayi (Franch.) Copel., a Sino-Himalayan species, described from S.W. China and previously known only as far west as Sikkim, has been discovered in the Baitadi District of west Nepal. This is much further west than might be expected and emphasises the possibility of more species being discovered in Nepal with increased collection and study.

Morphotype and conflicting taxonomies in Pteridium (Dennstaedtiaceae: Pteridophyta)
J. A. Thomson pg(s) 101-109
ABSTRACT
Conflicting taxonomic treatments of the diploid bracken ferns of the Laurasian lineage within Pteridium are briefly reviewed. The infraspecific entities recognised in this section of the genus can be separated on morphological, phenological and physiological criteria into two main groups referred to respectively as ‘aquilinum’ and ‘latiusculum’ morphotypes. Evidence of gene flow between morphotypes is discussed, including the finding from DNA studies that taxa of the ‘aquilinum’ and ‘latiusculum’ morphotypes in each major geographic region are more closely related to the contrasting morphotype from the same region than to the corresponding morphotype from another region. It is proposed here that the ‘aquilinum’ and ‘latiusculum’ morphotypes may be regarded as mediated by a simple genetic polymorphism involving alternative pleiotropic alleles at a single major morphogenetic locus comparable to those previously described in Athyrium and postulated in Asplenium and Pteridium, but other possible models are discussed.
It is concluded that P. aquilinum is best treated as a single species containing at present 11 subspecies.

SHORT NOTES

Corrections to A revised handbook to the Flora of Ceylon, Volume XV, Parts A & B, Ferns and Fern-allies
M. Shaffer-Fehre pg(s) 98-99

Two new species of Selaginella subgenus Heterostachys (Selaginellaceae) from the Guianas – a correction
M. Gibby pg(s) 100

BOOK REVIEWS

The Liverworts, Mosses and Ferns of Europe, by Wolfgang Frey (Hornworts and Liverworts), Jan-Peter Frahm (Mosses), Eberhard Fischer and Wolfram Lobin (Ferns and Fern-allies). Translated and updated by the authors with illustrations prepared by H. Lunser (Bryophytes) and E. Fischer (Ferns).
M. Rickard pg(s) 110

Biology and evolution of Ferns and Lycophytes. Tom A. Ranker & Christopher H. Haufler (eds)
M. Gibby pg(s) 111

The website of the British Pteridological Society