The Fern Gazette Volume 21 Part 8

Published 21st October 2022
The Review and Main Articles will be available free of charge 2 years after the publication date.
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Edited by M. Gibby & A. Leonard


MAIN ARTICLES

Monitoring of a founder population of the hart’s tongue fern (Asplenium scolopendrium) on a former sea-floor (Jagersveld) over 34 years (1985 – 2018)
P. Bremer & A. Smit pg(s) 437-449
ABSTRACT
Over a 34 year period a founding population of the Hart’s Tongue Fern was monitored in the Jagersveld near Lelystad (reclaimed polder O.-Flevoland, 1957), a young woodland plantation on a former sea-floor with a sandy clayish soil. In 1985 there were only two individuals, but numbers increased sharply in the late 1990s and since 2005 has matched the national trend. The first cohort consisted of plants that established independently and subsequent recruitment was strongly related to these founding plants. The longevity of sporelings, juvenile and subadult plants proved to be 1.1, 1.6 and 1.7 years. Adults lived on average 4.4 years based on plants that completed their whole life cycle during the 34 years of monitoring. The half-life of the whole population was 4.5 years. Annual rainfall had a positive impact on the survival of adults, spring rainfall on the transition from juvenile to subadult. Severe winters had no impact, probably because winters became milder. Small-scale land-slips along the (dry) ditches and self–thinning were shown to be the most important factors in mortality. A further increase in population size is expected because of the increase in mild winters associated with climate change

Dryopteris carpatica spec. nov. – a tetraploid species of the Dryopteris affinis aggregate (Dryopteridaceae, Polypodiopsida) from the southern Carpathians
S. Jessen, W. Bujnoch & J. Fuchs pg(s) 451-466
ABSTRACT
A new tetraploid species of the Dryopteris affinis aggregate is described from the Romanian Carpathians. Results of flow cytometric, cytological and molecular genetic investigations are discussed

An unexpected Equisetum (Equisetaceae) taxon new to the European flora
M. Lubienski & J. Fuchs pg(s) 467-488
ABSTRACT
A new diploid nothosubspecies of Equisetum ×moorei is described from a limestone quarry in Germany as the cross between the alien E. hyemale subsp. affine and E. ramosissimum. Its diagnostic features are listed in detail and compared with those of native European E. ×moorei, the parent taxa of both, and the somewhat similar triploid E. ×geissertii. Plants close in morphology to the new taxon are found in Japan, where both parent species co-occur naturally. The name of the new nothosubspecies refers to this fact and hence a type specimen from Japan is selected

Cytology of the rare and threatened sickle fern Pellaea falcata (Pteridaceae: Pteridophyta) from India
A. Amirtham, V. Irudayaraj, A. Benniamin & L.J.P. Arulanandam pg(s) 489-493
ABSTRACT
There are five species of Pellaea in India, of which three are critically endangered. The cytology of only two are known; the cytology of P. falcata is known only from Australia as a diploid sexual taxon. Pellaea falcata has been collected from Meghamalai (Western Ghats, India), a new distributional area in India, and the present cytological study shows that it is tetraploid and sexual (n=58, 2n =116), with 64 normal spores per sporangium. This is the first chromosome count for P. falcata from Asia and is a new cytotype for this species

SHORT NOTE

Asplenium lepturus forma filiforme (Aspleniaceae), a new form from South-East Asia
A. Edward Salgado pg(s) 495-497
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