A new speices of Orthotrichum
is described from Tuva Republic, South Siberia. It is similar to O.
obtusifolium and O. gymnostomum in obtuse leaf and abundant gemmae
produced on leaf surface. However O. furcatum Otnyukova sp. nov. differs
from them in high and (2-)3(-4)-forked papillae on both sides, one per cell,
its leaf margin crenulate in the upper half of leaf due to large papillae on
marginal cells.