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The Fern Gazette Volume 19 Part 2

Published 25th June 2012


Edited by M. Gibby & A. Leonard


COMMEMORATIVE ARTICLES

Portrait of Clive Jermy
M.H. Rickard pg(s)33

Clive Jermy – A tribute on the occasion of his 80th birthday, 3rd July 2012
M.H. Rickard pg(s) 34-36

MAIN ARTICLES

Is Equisetum ramosissimum (Equisetaceae: Equisetophyta) native to the British Isles?
F.J. Rumsey & M. Spencer pg(s)37-46
ABSTRACT
A review of historic collections at BM has revealed a specimen of Equisetum ramosissimum collected by Buddle on Hounslow Heath in c.1705. This thermophilous ruderal species has generally been considered a recent introduction in the British Isles, first reported in 1949, its neophyte status having implications for its continuing protection under Schedule 8 of the Wildlife and Countryside Act and other conservation actions. The hybrid with E. hyemale (E. × moorei) has long been known from the Irish east coast, in the absence of E. ramosissimum. Recently its hybrid with E. variegatum (E. × meridionale) has been recorded from Anglesey. Its recognition prompted a review of specimens of Equisetum subgenus Hippochaete from the Cheshire/Lancashire coast which showed obvious similarities, most previously regarded as E. variegatum or E. × trachyodon. The majority show distinctive micro-morphological characters associated with E. ramosissimum and are considered to be E. × meridionale, or possibly an as yet un-described triploid backcross to E. variegatum. Subsequently another overlooked BM herbarium specimen of E. ramosissimum from the Liverpool area, collected in the 19th century, was detected. We present a summary of the known occurrences of the species and, in the light of these new discoveries, reassess the species status as “Native or Alien”.
Cryptogramma bithynica spec. nov. (Pteridaceae, Pteridophyta) – a new fern species from Northwestern Anatolia / Turkey
S. Jessen, L. Lehmann & W. Bujnoch pg(s) 47-54
ABSTRACT
An octoploid taxon of Cryptogramma from the Uludağ Mts. in northwestern Turkey is described as a new species, Cryptogramma bithynica S. Jess., L. Lehm. & Bujnoch. An overview of the genus is given.
ZUSAMMENFASSUNG
Ein octoploides Taxon von Cryptogramma vom Uludağ in der nordwestlichen Türkei wird als neue Art, Cryptogramma bithynica S. Jess., L. Lehm. & Bujnoch beschrieben. Ein Überblick über die Gattung wird vorangestellt.

Diphasiastrum tristachyum (Pursh) Holub (Lycopodiaceae: Lycopodiophyta) – an overlooked extinct British native
F.J. Rumsey pg(s) 55-62
ABSTRACT
During a study of herbarium material previously ascribed to Diphasiastrum × issleri (Rouy) Holub specimens belonging to the continental European and North American D. tristachyum (Pursh) Holub, a taxon not hitherto definitely recorded from the British Isles, were found. While its identity was correctly suggested by Babington when found, it was initially reported as D. complanatum before later being placed in D. alpinum and subsequently formed the first accepted British record for D. × issleri. The status of this material is discussed and it is considered to be native to the British Isles. Although not re-found since its discovery in 1866, some suitable habitat remains; given the decline in all lycopods in lowland England it is, however, best considered extinct (EX) and unlikely to re-appear.

The website of the British Pteridological Society