Picea omorika is an endangered conifer endemic to Serbia and Bosnia-Herzegovina. This research reports the first case of its naturalisation in Italy, specifically in a restricted area of the upper Brembana Valley (Orobic Alps, Lombardy), where an uneven-aged population, of approximately 50–60 individuals, grows within a wood pasture at 1,760–1,790 m a.s.l., inside the Orobie Bergamasche Regional Park. Dendrochronological analysis indicates that this population likely originated from a single tree planted for ornamental purposes near a mountain hut in the 1960s. Over the past 30 years, the species has propagated in the study area under cold, suboceanic climatic conditions and on moderately moist, nutrient-poor, slightly acidic soils, as inferred from climatic data and Ellenberg ecological indicator values. Grime’s competitor, stress tolerator, ruderal (CSR) functional strategy analysis classified P. omorika as a strictly stress-tolerant species (C = 0.0%, S = 100.0%, R = 0.0%) with low invasive potential. Phytosociological analysis indicates that the P. omorika community is part of a secondary succession that is progressing from pastures of Nardion strictae towards high-montane coniferous forests of Piceion excelsae . This research contributes to a better definition of the ecological niche of P. omorika .

A comprehensive checklist of vascular flora occurring in the lower Sieve Valley basin (province of Florence, Tuscany) is presented. Despite its economic and agricultural significance, this territory has been largely overlooked by botanists, resulting in a substantial gap in floristic information. The checklist is based on bibliographic analysis and field studies carried out between 2018 and 2024. A total of 1034 spontaneous taxa (species and subspecies), including 141 aliens, are reported for the territory. Of these, 21 taxa represent new records or confirmations for the province of Florence and 893 taxa are new to the lower Sieve Valley. Tilia americana L. and Sequoia sempervirens (D.Don) Endl. are newly reported for Tuscany and Populus × canadensis Moench nothosubsp. canadensis should be considered as a naturalized alien in the region. Life forms and chorotypes exhibit pronounced Eurosiberian affinities, with a significant contribution from Mediterranean plants. This pattern aligns with the temperate and continental climate of the area, which is partially influenced by summer aridity.

Nowadays species belonging to the green algal family Characeae are highly endangered. For this reason, many of them are protected by European directives and included in Red Lists. In Italy, however, the Red List of Characeae does not exist and the distribution of these species is often unknown, especially in Sicily wetlands. In this study, we investigated the distribution and morphology of Characeae in fresh and brackish water wetlands, both natural and artificial, located in various areas of eastern Sicily (Italy). During the survey Chara globularis Thuiller, Chara vulgaris Linnaeus, Nitella capillaris (Krocker) J.Groves & Bullock-Webster, and Tolypella glomerata (Desvaux) Leonhardi were found. This is the first record of these species in the investigated sites. The results improved the knowledge of freshwater algal biodiversity in Sicily and, above all, allowed to fill distribution gaps of the Characeae species, to apply adequate protection measures and create national Red Lists of Characeae.

Lupinus gredensis is generally treated as an endemic species to the Iberian Peninsula, with some occurrences reported for the eastern Mediterranean, considered to be the result of an introduction. The finding of five populations attributable to L. gredensis on the south-eastern slopes of Mt. Etna (Sicily, Italy) is here reported for the first time. Lupinus gredensis samples from Mt. Etna were morphologically compared with fresh and herbarium preserved specimens of the related species L. luteus and L. hispanicus. The distribution and the ecology of the surveyed populations, as well as the phytosociological characterization of the plant communities hosting L. gredensis are defined. Finally, the chorological status of this species in Sicily is discussed through the review of the historical occurrence of L. luteus in the Mt. Etna area, providing new data on the putative distribution range of L. gredensis in the Mediterranean region.

We studied the vascular flora of the isthmus of Feniglia, a Nature Reserve in southern Tuscany stretching between the Italian Peninsula and Mt. Argentario. Since the nineteenth century, the area has undergone significant environmental modifications due to intensive grazing and deforestation. Later, rehabilitation interventions were carried out, including reforestation and planting of dune species, making it an interesting protected area to study for its botanical aspects. Therefore, we aim to compile the floristic inventory of this distinctive Mediterranean area by integrating old and new data. The checklist comprises 502 specific and subspecific taxa of vascular plants. The life-form spectrum shows a predominance of therophytes, followed by hemicryptophytes. The chorological spectrum highlights the dominance of Mediterranean species, followed by Euromediterranean and Eurasian species. The presence of 15 species of regional importance, 3 species of the Italian red list and 3 Italian endemics (Ornithogalum exscapum Ten., Limonium multiforme Pignatti, Linaria purpurea (L.) Mill.) is noteworthy. Despite the environmental changes undergone in this area, our study reports the presence of remarkable species, including rare ones such as Atriplex littoralis L., Ruppia spiralis L. ex Dumort., and species at their distribution margin in the Italian Peninsula, such as Staphisagria macrosperma Spach, Juncus sorrentinoi Parl. and Maresia nana (DC.) Batt. Additionally the presence of 26 alien species, of which 15 are invasive, 9 naturalized and 2 casual, indicates a relatively low presence of alien species. Notwithstanding the significant environmental changes that the Feniglia isthmus has experienced in the last century and the high tourist pressure during the summer, the presence of the protected area suggested the effectiveness and benefits of such a form of protection for plant diversity.

This paper deals with the basidiomycete Pleurotus nebrodensis, one of the rare examples of endemic fungi in Italy and Europe. After clarifying the taxonomy of this taxon, including a comparison with a species from China misidentified as “Pleurotus nebrodensis”, we describe the characteristics of its natural habitat, and provide a new morphological description and information on its pilot-scale cultivation, current conservation status according to IUCN criteria and conservation strategies. New ITS region sequences were deposited in GenBank. Furthermore, the antibacterial and anti-cancer properties of P. nebrodensis are mentioned, making it a potential medicinal mushroom. Finally, a critical analysis, on a phylogenetic basis, of the Italian production of substrates inoculated with “P. nebrodensis” strains is also included.

In this contribution, new data concerning the distribution of vascular flora alien to Italy are presented. It includes new records and status changes from casual to naturalized for Italy or for Italian administrative regions for taxa in the genera Callianthe, Chamaecyparis, Chamaeiris, Cotoneaster, Erigeron, Freesia, Hemerocallis, Juglans, Kalanchoë, Ludwigia, Nassella, Paulownia, Physocarpus, Pistia, Saccharum, Setaria, and Vachellia. Nomenclatural and distribution updates, published elsewhere, and corrections are provided as supplementary material.

In this contribution, new data concerning the distribution of native vascular flora in Italy are presented. It includes new records, confirmations, and exclusions to the Italian administrative regions for taxa in the genera Anacyclus, Anthyllis, Bolboschoenus, Catapodium, Festuca, Hordeum, Lavandula, Ophrys, Pseudopodospermum, Rosa, Sorbus and Spergula. Nomenclatural and distribution updates, published elsewhere, and corrigenda are provided as Suppl. material 1.

In this study, we compared current data and data of the census made in the 1990s related to the vascular flora of Capo Mortola (Ventimiglia, Italy), considering 270 taxa not dependent on crop management. The current status reported 198 alien species: 5 invasive, 65 naturalized 75 casual, 38 occurring as casual in human-dominated systems, but without direct intervention by humans and not close to parent plant, 15 occurring as casual alien, but still with some uncertainties for a definitive classification, and plus 3 cryptogenic and 1 eradicated (extinct) taxa, while in 1996 were 229 species: 87 naturalized and 142 adventitious (casual). Of these, 40 taxa show an increasing trend and 41 a decreasing or disappearing trend. If we consider the wild areas of Capo Mortola, 10 taxa are new to the Italian flora (7 casual and 3 naturalized) while 13 are new to the Ligurian flora only (all casual). If we also consider the neglected areas of the Botanical Gardens, 18 new casual species for the Italian flora and 10 for the Ligurian one would be added. In addition, 9 status changes are proposed on a national scale and 17 on a regional scale. An in-depth analysis was conducted on the presence and the local history of a subset of 34 exotic plants, 11 of which are new or have a new status for the Italian flora.

In this contribution, the conservation status assessment of three vascular plants according to IUCN categories and criteria is presented. It includes the global assessment of Limonium parvifolium Tineo and Viscaria alpina (L.) G.Don, and the regional assessment of Rhazya stricta Decne. (Iraq).