Abstract
Abstract The validity and the taxonomic status of Racomitrium marginatum Lojac. are discussed. This doubtful Sicilian moss, validly reported in the «Index muscorum», is closely related to R. lanugfnosum (Hedw.) Brid. of which it has been considered as a mere synonym. Studying a specimen of R. lanugfnosum from vicinity of the locus classicus of R. marginatum, BRIZI remarks the insubstantiality of this species and affirms that it is a form of R. lanugfnosum adapted to arid and dry environments. According to this opinion and on the basis of the examination of the specimen studied by Lojacono (PAL), it has been given a more suitable interpretation of this doubtful entity. Therefore it is described as a new form named Racomitrium lanugfnosum (Hedw.) Brid fo. aetnense Dia et Raimondo.
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