DIPNET

Tenore (1826) originally described Artemisia variabilis from the surroundings of Naples. Later on, Gussone (1843) gave this taxon also for Sicily. It was considered as a species in all the italian Floras of the last Century (Bertoloni, 1853; Arcangeli, 1882 e 1894; Cesati & al., 1884). In the first half of the twentieth century, the name Artemisia variabilis had less fortune: Fiori (1903 and 1927) considered Artemisia variabilis just a variety of A. campestris L. More recently, Zangheri (1976) gave it as a possible synonym of A. campestris subsp.

On the Olea europaea L. var. sylvestris Brot. woodlands in Sardinia. The phytosociological analysis of Olea europaea. var. sylvestris woodlands occurring in Sardinia are here presented. The following sintaxa are described for the first time: Cyclamino repandi-Oleetum sylvestris and Myrto communis-Oleetum sylvestris are referred to the Quercion ilicis alliance while Asparago acutifolii-Oleetum sylvestris and Asparago albi-Oleetum sylvestris are referred to the Oleo-Ceratonion alliance.

This paper deals about some nitrophilous associations of northem Sardinia. These associations are included in the classes: Pegano-Salsoletea Br.-Bl. e O. de Bolòs 1957, Stellarietea mediae R. Tx., Lohm et Preising in R. Tx. 1950 and Artemisietea vulgaris Lobm, Prsg. et Tx. in Tx. 1950. The new associations Camphorosmo monspeliaceae-Halimionetum portulacoidis, Sileno albae-Acanthetum mollis, Smyrnietum rotundifolii, Bryonio marmoratae-Aretum pieti e Dauco maximi-Magydaridetum pastinaceae are here proposed.

The vegetation map of S'Ena Arrubia Lagoon in centre-western Sardinia (1: 2,500 scale) is presented and some diachronic remarks are made by referring to historical data available. The main object of this cartography, after a research on the biotope vegetation, is to allow the biomonitoring of an extremely important site for the biodiversity conservation (Protected Area: SIC, ZPS, IBA), which is to use for an ecologically aware management.

Criterio B-EOO inferiore a 5000 Km2 e AOO inferiore a 500 Km2, inoltre la sua popolazione si ritrova in quattro locations; per la specie è stato osservato, e si prevede per il futuro, una riduzione dell'estensione dell'habitat per edificazione ad uso turistico e cambiamenti d'uso nel territorio. Categoria di rischio: Endangered, EN B1+ 2ab (iii).

Categoria di rischio: Critically Endangered, CR B1ab (ii, iii, v)+ 2ab (v). Criterio DA causa della massima minaccia possibile, rappresentata attualmente dalla pressione turistica, in costante aumento negli ultimi anni, la specie, presente in un'unica location e con AOO< 20 Km2, potrebbe ricadere, nell'arco di un breve periodo di tempo, in una delle categorie di minaccia superiori. Categoria di rischio: essendo soddisfatte le opzioni del sottocriterio D2, la specie ricade nella categoria Vulnerable, VU D2.

The results on the phytosociologic analysis on some shrub caducous meso-higrophylous communities are here presented. The study involves the north-western part of Sardinia (Italy), with major attention to the carbonatic and volcanic sectors of'Sassarese'and'Nurra'. The new associations Vinco sardoe-Rubetum ulmifolii, Crataego monaginae-Pyretum amigdaliformis and Rhamno alatermi-Spartietum juncei are here described.

The trachyte-basalt biogeographic sub-district of the north-western Sardinian district, included in the coastal and hill sub-sector of the Sardinian sector, is characterised by two large effusive complexes: Rhyolites, Andesites and Dikes of the Oligo-Miocenic limestone/alkaline cycle (14-32 Myrs), and alkaline Basalts, Rhyolites, Rhyodacites and Dikes of the volcanic cycle with alkaline, transitional and sub-alkaline affinity of Pliocene-Pleistocene (0.14-5.3 Myrs).

This study describes the vegetation of S'Ena Arrubia lagoon, in the Gulf of Oristano, in the centre-western coast of Sardinia. This lagoon is classified as: Special Protection Zone (SPZ) according to EEC Directive 79/409, community importance site according to EEC Directive 92/43, IBA (Important Birds Area) site and fixed oasis of fauna protection and natural reserve. Throughout the years it was subject to several alterations.

We present here the results from a phytosociological and synchorological study of the deciduous oak woods of Sardinia. This vegetation analysis has allowed the individuation of three new associations: Lonicero implexae-Quercetum virgilianae, Ornithogalo pyrenaici-Quercetum ichnusae and Glechomo sardoae-Quercetum congestae.

The aims of this research were to contribute to the knowledge of the Mediterranean temporary wet habitats vegetation and to investigate the spatial distribution and the temporal successions of plant communities under different hydrological regimes in North Western Sardinia.

B. ANZALONE, Roma (I) PV AruuGONI, Firenze (I) G. AYMONIN, Paris (F) C. BALLETI'o, Genova (I) P. BAMPs, Meise (B) A. BOZZINI, Roma (I) A. CERUTI, Torino (I) F. CINELU, Pisa (I) C. CORTINI PEDROTTI, Camerino (I) A. DE PHILlPPIS, Firenze (I) F. EHRENDORFER, Wien (A) M. FOlllERI, Roma (I) F. GARBARI, Pisa (I) C. GOMEZ-CAMPO, Madrid (E) J. GRAU, Miinchen (D) W. GREUTER, Berlin (D) R. GROLLE, Jena (D) JB HARBORNE, Reading (GB) CC HEYN, Jerusalem (lL) VH HEYWOOD, Kew (GB) C.

Contribution to the knowledge of the Sardinian Laurus nobilis L. stands, a priority habitat of the 92/43/EEC Directive. The results of the phytosociological study of the Sardinian Laurus nobilis L. stands are here presented. The statistical analysis of the surveys, carried out on the best known populations, allowed us to recognize four new plant communities, referred to one association and three subassociations. In Sardinia the Laurus nobilis L.

Abstract This paper deals with the anatomical and histological study of a silicified specimen of a palm consisting of a part of the trunk surrounded by roots. The sample comes from the Lower Miocene of North West Sardinia. The comparison with fossil species and exsting species leads to the conclusion that the specimen belongs to a new fossil species closely related to Chamaerops humilis L., widespread throughout the Mediterranean area.

The trachybasalt biogeographic sub-district of the NW Sardinian district, included in the coastal and hilly sub-sector of the Sardinian biogeographic sector, is characterised by two large effusive complexes: that of the rhyolites, andesites and dikes of the Oligo-Miocene alkaline volcanic cycle (14-32 Ma) and alkaline basalts, rhyolites, rhyodacites and dikes of the volcanic cycle with alkaline, transitional and sub-alkaline affinity of the Pliocene-Pleistocene (0.14-5.3 Ma).

Uno studio della vegetazione condotto con metodo fitosociologico (Gehù & Rivas-Martinez, 1981) porta all'identificazione delle associazioni vegetali presenti in un territorio. Le piante infatti con la loro presenza indicano la condizione ecologica dell'ambiente in cui vivono attraverso le loro caratterizzazioni floristiche, strutturali ed ecologiche.

In this work we talk about coastal and littoral terrestrial habitats and plant communities in Northern Sardinia. We check the right attribution of different plant communities to their habitat type, among those indicated in the Annexe I of the 43/92/EEC Habitat Directive, and the coherence between the Natura 2000 Network and the tested habitat presence in the study area.

This paper presents a phytosociological study of the halophyle, chamaephytic and hemicryptophytic communities prevalently consisting of Limonium sp. pl., which are localised behind the dunes of Sardinian coastal sites on sandmuddy substratum in humid and flat areas, between the drier communities and the more hygrophilous ones.