Search results for " Sistematica"

Nuova stazione di Euphorbia serrata in Sicilia

2007

A new record of Euphorbia serrata (Euphorbiaceae) from Sicily. - Euphorbia serrata L. is reported from a new locality in Sicily near Mazara del Vallo (Trapani). Data on the biological cycle and the phytocoenosis in the new Sicilian locality are also reported.

The genus Isoëtes L. (Lycophyta, Isoëtaceae): Synthesis of karyological data

2001

Summary A synthesis of relevant karyological data regarding the genus Isoetes is given, with an up-to-date check list of chromosome numbers including 152 records referring to 67 taxa (62 species and 5 infraspecific taxa) and 16 hybrids. Total of different chromosome counts (considering two or more cytotypes for certain taxa, excluding hybrids) is 80. Probable base number is x = 11, even though x = 10 and x = 12 have been proposed for certain species. On the basis of data here summarized, the mean percentage of polyploidy is 61.2%; 31 taxa are diploids (38.8%), 28 are tetraploids (35.0%), 8 are hexaploids (10.0%), with a few species each which are tri-, penta-, octo-, deca- and dodeca-ploids…

Ex situ conservation of Sicilian endemic species in the Botanical garden of Catania University

2009

ECOLOGICAL FEATURES OF MACROMYCETES IN EUCALYPTUS REFORESTATIONS IN SICILY (SOUTHERN ITALY)

2009

The objective of this work was to compare and estimate the ecological features of 192 macromycetes, including nine hypogeous and three semi-hypogeous fungi, collected in Sicilian areas reforested with Eucalyptus. The number of mycorrhizal fungi turned out to be only 22 % of the taxa recorded so far from other areas, and this underlines the difficulties of eucalyptus trees in adapting to the pedological and climatic conditions of Sicily.

PESI - a taxonomic backbone for Europe

2015

Reliable taxonomy underpins communication in all of biology, not least nature conservation and sustainable use of ecosystem resources. The flexibility of taxonomic interpretations, however, presents a serious challenge for end-users of taxonomic concepts. Users need standardised and continuously harmonised taxonomic reference systems, as well as highquality and complete taxonomic data sets, but these are generally lacking for nonspecialists. The solution is in dynamic, expertly curated web-based taxonomic tools. The Pan-European Species-directories Infrastructure (PESI) worked to solve this key issue by providing a taxonomic e-infrastructure for Europe. It strengthened the relevant social (…

Indagini fitosociologiche sulla vegetazione a Bupleurum fruticosum (Umbelliferae) del versante tirrenico della Sicilia orientale

2009

Phytosociological researches on the Bupleurum fruticosum vegetation on the tyrrhenian side of Eastern Sicily. The results of a phytosociological study carried out on some Bupleurum fruticosum shrubby formations, recorded in the Tyrrhenian side of eastern Sicily, are presented. This plant com- munity, characterized by a high occurrence of sclerophylls, is proposed as a new association named Spartio juncei-Bupleuretum fruticosi (holotypus: ril. n° 13 in Tab. 1), included in the suball. Pruno- Rubenion (Pruno-Rubion, Prunetalia, Rhamno-Prunetea).

Allium paniculatum L., una specie critica ed erroneamente interpretata della flora europea

2010

Dalle indagini morfologiche e cariologiche condotte è emerso che Allium paniculatum è una specie ben differenziata dagli altri taxa della sez. Codonoprasum, con corredo cromosomico poliploide, esaploide o triploide, probabilmente originatosi in seguito all’adattamento ad ambienti sinantropici in territori con bioclima marcatamente mesico, come si desume dalle esigenze ecologiche, dal periodo di fioritura estivo e dalla distribuzione geografica.

Ellenberg’s Indicator values for the Flora of Italy – first update: Pteridophyta, Gymnospermae and Monocotyledoneae

2012

Ellenberg’s indicator values are an useful tool to delineate the relationship between plants and environment, recognising to each species a functional role as biological indicator. In the frame of the second edition of the Pignatti’s “Flora d’Italia”, some new informative systems are under preparations, in order to support geobotanical/applied studies, including a complete and updated review of the Ellenberg’s indicator values for the whole bulk of species mentioned in the flora of Italy. This first contribution includes a list of 380 species of Pteridophyta, Gymnospermae and Monocotiledoneae that complete the first assignment of the Ellenberg’s indicator values to the flora of Italy, publi…

New records and observations to the Characean flora (Charales, Charophyceae) of Sicily (Italy)

2019

New records to the Characean flora of Sicily are presented. Five species (Chara baltica, C. conimbrigensis, C. oedophylla, Nitella gracilis, Tolypella salina) are new to Sicily, two of them being also new to Italy (Chara conimbrigensis, C. oedophylla). Two species are confirmed for Sicily (Chara aspera, Nitella opaca), three (Chara braunii, C. canescens, Nitella capillaris) are rare taxa. The Characean flora of Sicily, updated with these records, currently includes 25 species, distributed in four genera: Chara (13 species), Nitella (eight species), Tolypella (three species) and Lamprothamnium (one species).

Measurement and Conservation of Species and Habitat Biodiversity at Different Scales on Small Mediterranean Islands

2021

In this paper we discuss current methodologies for measuring biodiversity, analyse pros and cons at different scales, and finally propose distribution mapping as the most suitable method for measuring floristic biodiversity on small Mediterranean islands. These territories often host endangered flora and habitats, and have peculiarities that distinguish them from the mainland and the larger islands.