Abstract
Two species of Amphidium, 15 species of Orthotrichum and 1 species of Zygodon are reported for Altai. Description, illustration, keys for identification and comments on species distribution are provided for all small species. Orthotrichum cupulatum, O. dasymitrium, O. laevigatum subsp. japonicum, O. vladikavkanum and Zygodon rupestris are reported in Siberia for the first time.