A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally
and three-dimensionally preserved sporangia from the Buçaco
Carboniferous Basin, western central Portugal
A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally
and three-dimensionally preserved sporangia from the Buçaco
Carboniferous Basin, western central Portugal