The Fern Gazette Volume 20 Part 8

Published 13th November 2018
The Review and Main Articles will be available free of charge 2 years after the publication date.
Until then they can be purchased from Bridget Laue


Edited by M. Gibby & A. Leonard


REVIEW

Global review of recent taxonomic research into Isoetes (Isoetaceae), with implications for biogeography and conservation
D.F. Brunton & A. Troia pg(s) 309-333
ABSTRACT
With the advent of cytological analysis, Scanning Electron Microscopy, the recognition of sterile hybrids, improved access to wild populations and increasingly comprehensive molecular investigations, there has been a revolution in Isoetes taxonomy in recent times. The last 40 years have seen an almost 100% increase in the diversity documented during the previous two centuries. Four geographic areas account for over 90% of this diversity: northern-central South America, eastern North America, western Eurasia (including the northern Mediterranean) and South to Tropical Africa. There is a significant global conservation concern for Isoetes, with many taxa being rare (known from one to a handful of populations) and some known only from herbarium specimens. The taxa of the extraordinary rock-outcrop pools and the ephemeral wetlands found in disjunct areas around the world appear to be particularly vulnerable to habitat destruction. We expect 100 or more new taxa to be described in coming years. Such taxonomic productivity will require more systematic cytological and molecular investigations to be undertaken. It also requires the assembly of a larger global inventory of high-quality voucher specimens to provide the material for such investigations.

Short biographies of the authors pg(s)334-335


MAIN ARTICLES

Growth of fern gametophytes after 20 years of storage in liquid nitrogen
V.C. Pence pg(s) 337-346
ABSTRACT
In vitro grown gametophytes of six species of ferns, which had been cryopreserved using the encapsulation dehydration procedure, were evaluated for survival after 20 yrs of storage in liquid nitrogen. Tissues were rewarmed and transferred to a recovery medium with the same methods originally used to test pre-storage viability. All six species resumed growth. Post-storage viability was not consistently higher or lower than pre-storage viability of LN exposed tissues, likely reflecting the small sample sizes. However, these results demonstrate that long-term storage in liquid nitrogen is a viable option for preserving gametophytes of at least some fern species and could be utilized as an additional tool for preserving valuable gametophyte collections and for the ex situ conservation of fern biodiversity.

SHORT NOTES

Two new combinations in grammitid ferns (Polypodiaceae) from New Guinea: Prosaptia ledermannii and Radiogrammitis habbemensis
B.S. Parris pg(s) 336,347
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