J. Szweykowski et K. Buczkowska, THE RHIZOID-INITIAL FIELD - A VALUABLE TAXONOMIC CHARACTER IN SPECIESOF THE GENUS CALYPOGEIA RADDI (HEPATICAE, JUNGERMANNIALES), Nova Hedwigia, 67(1-2), 1998, pp. 23-43
The anatomical structure of the underleaf base in the European species
of the genus Calypogeia has been studied in longitudinal stem section
s. This base consists of two largely independent parts: the one-layere
d rhizoid-initial field and the underleaf base proper. The distinct di
fferences between particular species were observed and a key for the C
entral European species of Calypogeia has been constructed on that bas
is. As these differences were stable in culture experiments and were o
bserved also in mixed colonies in the field, we conclude that the stru
cture of the underleaf base is here, most probably, genetically fixed.