|Berg, C; Dengler, J: Moose und Flechten als diagnostische Arten von Pflanzengesellschaften - eine Übersicht aus Mecklenburg-Vorpommern., Herzogia , 18, 145-161 (2005)|
|Key words: Bryophytes, classification, holocoena, lichens, northeast Germany, phytosociological methodology, plant communities, synusiae|
Within the project ‘Plant communities of Mecklenburg-Vorpommern and their vulnerability’ (BERG et al. 2001, 2004), 42,207 relevés from this federal state in northeast Germany have been evaluated. They have been presented by means of synoptic tables. These comprise 332 taxa of bryophytes and 72 taxa of lichens (epigeic and aquatic), a large proportion of which has a diagnostic value for the classification of vegetation. We give an overview of the phytosociological ‘behaviour’ of these cryptogams in relation to the phytocoena (holocoena) of the study area. Only in five of the 34 vegetation classes that we have distinguished bryophytes are neither character taxa nor joint dif- ferential taxa on class level. Lichens play a classificatory role in eight classes. Both, bryophytes and lichens, thus are important for the classification of most vegetation types. These taxonomic groups therefore should be thoroughly regarded both in the field and in the phytosociological ‘table work’, including epiphytic, epixylic and epilithic species. Relevés in which cryptogams have not been treated, should be only exceptionally used for syntaxonomic classification. The constancy values in synoptic tables then must be corrected by the ‘cryptogam factor’. Finally, we point out that the clear conceptual and methodological separation between plant communities (holocoena) rich in cryptogams and cryptogam synusiae (merocoena) within other plant communities is indispensable for phytoso- ciological surveys.