Andreaea flexuosa R. Brown bis subsp. luisieri Sérgio et Sim-Sim (Andreaeaceae), a new taxon from Madeira Island

A taxonomic study of critical plants belonging to the ecostate Andreaea from Madeira Island is presented. A new taxon, Andreaea flexuosa R. Brown bis subsp. luisieri Sérgio et Sim-Sim, is proposed based on material from upland areas in the central ridge of Madeira. Characters discriminating the two subspecies are presented and illustrated; data on ecology and distribution of the two subspecies are discussed.