title: Polypodium Interjectum And P. × Mantoniae (Polypodiaceae) In The Polish Sudetes
abstract: Abstract Detailed analyses of micro- and macromorphological features of 247 specimens representing the Polypodium vulgare complex, combined with DNA content measurements, revealed the presence of tetraploid P . vulgare s.str., hexaploid P. interjectum and the pentaploid hybrid P . × mantoniae in the Polish Sudetes. For species identification, sporangium structure (number of indurated and basal annulus cells) was found to be the most stable and thus the most valuable and taxonomically significant
journal: Polish Botanical Journal