Search results for "Pteridophyte"
showing 10 items of 13 documents
European Red List of Lycopods and Ferns
2017
In recent years, awareness has risen surrounding the crucial role of plants in providing ecosystem services and on their decline – they are one of the essential foundations of healthy ecosystems that we depend on. However, significant gaps in knowledge still remain. In this context, the European Red List of lycopods and ferns provides the first ever comprehensive assessment of the extinction risk of all native lycopod and fern species to Europe. With 194 species assessed, this assessment highlights that 19.9% of lycopod and fern species are threatened with extinction in Europe. This is mainly due to urban and infrastructure development, human intrusions and disturbance, pollution, and water…
The first confirmed population of the globally endangered Pilularia minuta (Marsileaceae) in Sicily
2016
Based on a recent collection made by the authors, the presence of the endangered Pilularia minuta Durieu in Sicily (Italy) is confirmed. Critical review of relevant literature and herbarium specimens suggests that the only previous report for the island, made in 1887, can, fairly confidently, be considered to be the result of a misidentification. There is an urgent need to protect the wetland at Anguillara (near Calatafimi), where the species was found.
The genus isoetes (Isoetaceae): A provisional checklist of the accepted and unresolved taxa
2016
Isoetes is a widely distributed lycophyte genus of at least 200 species occurring in diverse habitats. The species can be difficult to identify because Isoetes, with its apparent simplicity of form and conserved morphology, provides few diagnostic features to reliably distinguish its species. The last worldwide monograph, published nearly a century ago, listed 77 taxa. The first step in producing a flora or monograph of all known species of a genus is to compile a list of the acceptable species names. The list presented here is a compilation of 192 accepted names representing taxa from regions around the world: chromosome numbers were assigned to 101 of them, with polyploidy settled on 46.7…
Osservazioni sulla flora pteridologica della Sicilia
2011
Biogeographia vol. XXX - 2071 (Pubblicato il 23 dicembre 2011) La Biogeografia della Sici/ia Osservazioni sulla flora pteridologica della Sicilia ANGELO TROIA, VTNCENZO ILARDI, FRANCESCO MARIA RAIMONDO Universita di Palermo - Dz'partz'mem.‘0 a’z' Biologia Ambientale e Biodiversita, via Arckirafi 38, I—90]23 Palermo (Italy); e—mail: ange[0.tr0z'a @[z'ber0.z'2f Key words: flora, pteridophytes, Lycopodiophyta, Monilophyta, ferns, Sicily SUMMARY An updated checll—list of Sicilian pteridophytes is presented: in total, there are 55 taxa, including 49 ferns in the strict sense (“monilophytes”) and 6 lycopodiophytes. Aspleniaceae is the most represented family in terms of speci…
A critical conspectus of ItalianIsoetes(Isoetaceae)
2014
The work on the Isoetaceae account for the Critical Flora of Italy has resulted in a new, synonymic inventory of Italian Isoetes taxa, based on herbarium studies, observation by scanning electron microscopy and critical re-examination of the previously published works. Ten species are listed. The names I. longissima and I. gymnocarpa are restored as correct, to replace I. velata and I. subinermis, respectively. Eighteen lectotypes, one epitype and one neotype are designated. A dichotomous key to Italian taxa is provided.
A critical conspectus of Italian Lycopodiaceae
2015
As a result of our work on the Lycopodiaceae account for the Critical Flora of Italy, a new, synonymic inventory of Italian taxa is presented, based on herbarium studies and critical re-examination of extant literature. Three genera with eight species are accepted: Huperzia (1 species), Lycopodiella (1), and Lycopodium (6). An additional, ninth species (Lycopodiella cernua) is listed as a casual alien. The genus Diphasiastrum, accepted in several recent works, is treated at sectional level within Lycopodium (three species and their three hybrids). Lycopodium lagopus ( = L. clavatum subsp. monostachyon) is a recent addition to the Italian flora. Images of five types and Internet URI of other…
Conspectus of Italian Selaginella (Selaginellaceae), with some typifications
2015
An annotated synonymic inventory of Italian Selaginella taxa, a practical key for their identification and their dot distribution maps are presented, as a result of our work on the Selaginellaceae account for the Flora Critica d'Italia. The names Lycopodium helveticum L. and Selaginella denticulata var. platystachya Hieron. are typified.
Mediterranean island biogeography: Analysis of fern species distribution in the system of islets around Sicily
2011
The aim of this article was to test the way in which geographical factors influence island floras in the Mediterranean basin, using ferns as target organisms, and the islands surrounding Sicily as location. A matrix with presence/absence data concerning fern taxa in the 16 islands studied was compiled. Cluster analysis, principal co-ordinates analysis (PCoA), principal components analysis (PCA) and a Bayesian analysis were performed. For each island, the total number of fern taxa was regressed against three factors: island area, island elevation and isolation. All the analyses pointed to affinities between islands according to their different geological composition, independently from their…
New data to distribution of ferns in Tajikistan (Middle Asia)
2016
The paper presents new chorological data of eleven fern species (Ophioglossum bucharicum, Azolla filiculoides, Botrychium lunaria, Gymnocarpium robertianum, Cryptogramma stelleri, Polystichum aculeatum, Asplenium trichomanes, Asplenium viride, Asplenium ruta-muraria, Adiantum capillus-veneris and Salvinia natans) in central Pamir Alai Mts in Tajikistan. Except Azolla filiculoides all of them are native to the flora of Tajikistan. The dry and warm climate in lowlands and middle mountains as well as harsh conditions in higher elevation of Pamir are not suitable for Pteridophytes. Thus, many of fern species are rare in Tajikistan, having less than five locations. List of localities of the spec…
On the presence, distribution and conservation status of Lycopodium lagopus (Lycopodiaceae) in Italy
2014
During our work on the Lycopodiaceae account for the upcoming Flora Critica d’Italia (1, 2), we assessed and accepted the presence in Italy of Lycopodium lagopus (Laest. ex Hartm.) Zinserl. ex Kuzen. = L. clavatum subsp. monostachyon (Grev. & Hook.) Selander (2). Already reported by Fiori (3) as L. clavatum f. monostachyum Desv., its presence in Italy was more recently confirmed by Tribsch & Schönswetter (4) and accepted in some subsequent regional works (e.g. 5, 6), but the taxon is not recognized as distinct in the last national checklist of vascular plants (7). Lycopodium lagopus has an arctic-alpine distribution in America and Eurasia (8, 9). Initially described as a variety of L. clava…