The Fern Gazette Volume 21 Part 4

Published 27th November 2020
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
Before then they will be accesible by BPS Members but will be password protected


Edited by M. Gibby & A. Leonard


MAIN ARTICLES

Distribution patterns and priorities for conservation of Iranian pteridophytes
A. Mehrabian, F.K. Nasab, C.R. Fraser-Jenkins & F.Tajikpg(s) 141-160
ABSTRACT
Iran is the most diverse region of Southwestern Asia and is the main zone of the Iranian plateau, located at the intersection of the Irano-Turanian and Sudano-Zambezian floristic regions. The pteridophyte flora of Iran is mainly a Mediterranean, European type flora, but with a few African elements in the southwest and a small ancient Asiatic component related to Sino-Himalayan species in the north. The northern slopes of the Alborz mountain system are significantly affected by the humidity of the Caspian Sea, which has created the conditions for the survival of a temperate zone and the concentration of many moisture-loving species (e.g. ferns, horsetails etc.). However, there are also a few species of ferns in the arid zones of the country. In order to analyze the species richness mapping, 0.25° × 0.25° universal transverse Mercator grid cells (25 km2 with the exception of boundary areas) were used as units of study. The conservation status of taxa was evaluated by GeoCAT, Kew. According to the present study, the Iranian pteridophyte flora includes 62 taxa of 27 genera belonging to 16 botanical families. Dryopteridaceae include the greatest numbers of threatened species (CR, EN, and VU) of Iranian pteridophytes. Some Iranian pteridophyes show a significant decline in populations resulting from vulnerability of their habitat. Unfortunately, illegal over-harvesting of different ferns for ornamental purposes in flower shops has caused a population threat to many species. The present study determines the complete overall distribution pattern for occurrence of any Iranian Pteridophyte in Iran species and describes species-based and ecosystem-based conservation priorities for habitat protection inside and outside the habitat.

Asplenium ×vogelii (Asplenium azoricum × A. trichomanes subsp. quadrivalens) (Aspleniaceae) a new endemic hybrid spleenwort from the Azores and the relationship and origins of its endemic parent, A. azoricum
F.J. Rumsey, A. Hendy & K.E. Jonespg(s) 161-168
ABSTRACT
The hybrid Asplenium azoricum × A. trichomanes subsp. quadrivalens is reported for the first time and described here as A. ×vogelii. Chloroplast DNA sequences are utilised to identify the maternal parent and provide further information on the relationships and possible origin of its endemic parent, A. azoricum. While definitely known only from the type gathering, collected near Terra Chã, Terceira in 1996, there is considerable potential for this hybrid to be overlooked owing to the similarity and variability of its parents.

Taxonomic and nomenclatural notes on Philippine ferns. III. Asplenium caudatum (Aspleniaceae) and ferns confused with it
A.E. Salgadopg(s) 169-184

ABSTRACT
The confused taxonomy of Asplenium caudatum, A. truncatilobum, A. truncatum and A. horridum is discussed. Data supporting their retention as separate species are presented and their nomenclatural histories reviewed. Asplenium caudatum is restricted to Tahiti; A. truncatum to the Malay Peninsula and the Western Sunda Islands; A. truncatilobum is a Philippine endemic found in central and northern Luzon; and A. horridum is a common fern of Hawaii, Samoa, Tahiti, and the Cook, Marquesa and Austral Islands.
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