Fedosov, V.E. & E.A. Ignatova. On Orthotrichum
pellucidum and O. hallii in Russia
Arctoa (2011) 20: 197-204
As a result of re-examination of
specimens of Orthotrichum cupulatum Brid. and O.
pellucidum Lindb. from Russia a rare xeric
species, O. hallii Sull. & Lesq., was
identified from Tyva Republic, southern Siberia; it is new for the moss flora
of Russia. Some new localities of O. pellucidum in Russia were also revealed. The description and illustration of
Russian specimens are provided, distinctive features
of species morphology and their distribution are discussed. Orthotrichum
hallii differs from O. pellucidum in completely bistratose leaf
lamina, mostly simple papillae and generally southern distribution, associated
with xeric regions of Asia and North America, while the latter species is known mainly from Arctic and Subarctic territories,
representing a circumpolar distribution.