Aportaciónes al conocimiento de las comunidades vegetales de los paredones rocosos calizos de la Cordillera Cantábricarevisión de la alianza "Saxifragion trifurcato-canaliculatae"; clase "Asplenietea trichomanis"

Abstract

A revisión of the endemic alliance of the Cantabrian mountains Saxifragion trifurcatocanaliculatae (Rivas Martínez 1969) Rivas Martínez, Izco & Costa 1971 is made. We recognize two suballiances, characteristic of limestone fissures: Saxifragenion trifurcatocanaliculatae Fdez. Prieto 1983, and Drabo dedeanae-Saxifragenion trifurcatae Fdez. Prieto 1983, both Eurosiberian, and we also establish two others, which comprise the plant communities characteristic of cavities and overhangs: Petrocoptidenion glaucifoliae subal. nov., Eurosiberian, and Petrocoptidenion grandifloro-viscosae subal. nov.,endemic of the Bierzo district (Mediterranean). We admit three associations in the suballiance Saxifragenion trifurcato-canaliculatae Fdez. Prieto 1983, and we establish Potentillo-Valerianetum apulae Rivas Martínez, ass. nov. In the suballiance Drabo dedeanae- Saxifragenion trifurcatae Fdez. Prieto 1983 we recospiize three associations and we also propose two jiew ones: Crepido asturicae-Campanuletum legionensis T. E. Díaz & Fdez. Prieto, ass. nov. and Saxifragetum paniculato-trifurcatae ass. nov. In Petrocoptidenion glaucifoliae subal. nov. we typify the association Petrocoptidetum glaucifoliae Rivas Martínez 1974. Also, in Petrocoptidenion grandifloro-viscosae subal. nov., we propose the association Campanulo-Leontodetum farinosi ass. nov. Finally, we point out the floristic, dynamic, chorological and ecological aspects of the mentioned syntaxa and we indicate the bioclimatic levéis and stages of each of them.