New data on distribution and ecology of rare in the Khanty-Mansi Autonomous District (Western Siberia) moss species (Bryophyta)

New locations of 25 rare species of mosses, known earlier in the Khanty-Mansi Autonomous District from one or a few locations, are provided. Their ecology, phytocenotic affinity and peculiarities of the distribution on the territory of the autonomous district and taiga zone of the Western Siberia as a whole are discussed. A high proportion of rare species in the moss flora of the central part of the taiga zone of Western Siberia resulted from limited distribution or absence of suitable habitats associated with stony substrates and outcrops of groundwater rich in mineral nutrition elements, as well as from intermediate (ecotone) position of the flora on the latitudinal bioclimatic gradient from south to north.