Abstract
Frullania is one of the largest genera of liverworts in Europe with morphologically polymorphic species in the Holarctic region, giving rise to reservations regarding the delimitation of some taxa. Initially described by Stephani (1887) from Portugal, Frullania calcarifera is a neglected liverwort in the semi-cryptic F. tamarisci complex. Following years of obscurity, F. calcarifera was eventually resurrected as a good species and reported from the Pyrenees, Italy, Algeria and more recently the Ukraine (Crimean Peninsula). In the present study, based on Portuguese material, distinguishing characters and illustrations of the types and representative specimens of F. calcarifera are presented. An updated distribution of F. calcarifera in Portugal, and a predictive model of its known areas of occurrence in Portugal is presented and discussed in relation to the distribution of its congener F. tamarisci.
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