Biogeographia vol. XX VII - 2006 (Pubb/icato il 30 dicembre 2006) Biogeografia delI’Appennino centrale e settentrionale: trenfanni dopo Fitogeografia apuana. ll genere Sp/mgmzm (Bryophyta): distribuzione attuale e aspetti di conservazione LUCIA AMADEI*, EMANUELE GUAZZI**, GIANNI BEDINI* *Mu5eo Bomnico, Dz'pzzrtime72r0 tl'iBi0[0giz1, 1/zizz Lzztzz G/Jini 5, 56]26P1':zz (Ital)/),' e-mail: [zz7mzdei@[2i0l0gizz. zmz;zgz'. it, g[9m'z'2zz'@bz'0/ogizz. zmz;z)z'. it **Pzzrc0 Regiomzle delle A4121’ Apuzzne, U. 0. “Ricerm e C0715€VU£ZZi077€”, z/izzle Stzzziolze 82, 54100 M51554 (Italy); e—mzzi[: egmzzzi @_pzzmzpmz7ze. it Key words: Sp/Jzzg/mm, Biyophyta, Apuan Alps, Tuscany, conservation SUMMARY The £lLltl1OI'S report the distribution of the genus Sp/mgwn/m in the Apuan Alps, resulting from a research initiated 21 few years ago. After a thorough search of bibliographic records and herbarium vouchers, known Sp/mgm/m stations have been checked in the Field and mapped on a digital cartographic base in a GIS environment. Then, we were able to draw the potential range of the genus, by superimposing the actual distribution map to the geologic map and by selecting the areas whose environmental parameters (aspect, elevation, substrate) are compatible with the ecological requirements of Sp/Jzzg7mm species. Further surveys were then made in the potential range, leading to the confirmation of 8 stations and to the discovery of 9 new stations, at elevations between 30 and 1050 m. mostly with northern aspect. Unfortunately, we could not confirm many known stations. We identified 8 floristic units, 6 at specific and 2 at varietal level. One species, 5. .rqm1rra.tm71, had never been reported earlier for the Apuan Alps. All populations are declining due to various sources of threat: changes in land management, groundwater extraction, infrastructure development. Finally, we propose a management plan aimed at avoiding the extinction of the Sp/)t1g71Itm populations from the Apuan territory. INTRODUZIONE Nell’ambito della collaborazione tra il Dipartimento di Biologia dell’UniVersita di Pisa (Museo botanico) e il Parco Regionale delle Alpi Apuane (U.O. “Ricerca e conservazione”), da alcuni anni e in corso urfindagine Che prende in esame — sotto l’aspetto floristico, fitogeografico e gestionale —— i popolamenti di sfagno distribuiti nel territorio del Parco. Lo sfagno e una briofita palustre a esigenze rnicroterme, strettainente calcifuga. Vive al borclo di laghetti 0 ruscelli, nelle Valli acquitrinose e in generale dove si forma un ristagno cl’aCqua che garantisce umidita costante. E molto diffuse nelle