Back Grupa za filogeniju pteridofita BS Systém PPG I Czech Pteridophyte Phylogeny Group French Pteridophyte Phylogeny Group ID PPG I Japanese Pteridophyte Phylogeny Group Dutch Grupo de Filogenia das Pteridófitas Portuguese Systém PPG I Slovak
The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes (lycophytes and ferns) that reflects knowledge about plant relationships discovered through phylogenetic studies. In 2016, the group published a classification for extant pteridophytes, termed "PPG I". The paper had 94 authors (26 principal and 68 additional).[1] The classification was presented as a consensus classification supported by the community of fern taxonomists, but it has been partially exclusive and is highly contested. Alternative classifications of ferns exist and are preferred by more general taxonomists (see below).