New Zealand Journal of Botany abstract
Davallia (Pteridophyta) in New Zealand, including description of
a new subspecies of D. tasmanii
M. J. VON KONRAT*
J. E. BRAGGINS
Plant Sciences
School of Biological Sciences
The University of Auckland
Private Bag 92019
Auckland, New Zealand
P. J. DE LANGE
Science and Research Unit
Department of Conservation
Private Bag 68908
Newton
Auckland, New Zealand
*Formerly M. J. Parsons.
Abstract The fern genus Davallia is represented by two
taxa in New Zealand; both are restricted in their distribution. D.
tasmanii subsp. tasmanii is limited to the Three Kings Islands,
north-west of Cape Reinga, New Zealand. The second taxon was discovered in 1984
and is known only from a single population in Puketi Forest, Northland. It is
described as a new subspecies, D. tasmanii subsp. cristata. It
differs from D. tasmanii subsp. tasmanii in the presence of
multiseptate hairs that are restricted to the apex of the rhizome scale,
conspicuous false veins, less complex venation pattern, and the generally
smaller frond features. Both extant New Zealand taxa may have diverged from a
common ancestor, but a previous suggestion that D. tasmanii subsp.
tasmanii is derived from D. canariensis is rejected. The
conservation status of both taxa are assessed, with an outline of potential
threats to their habitat.
Keywords Davalliaceae; Davallia; D. tasmanii
subsp. tasmanii; D. tasmanii subsp. cristata;
new subspecies; taxonomy; conservation; New Zealand flora
B98034
Received 12 June 1998; accepted 7 April 1999
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