1. Leaves
unbordered; peristome double, with thin exostome teeth and
endostomial segments; western part of European Russia (currently
known only from Kaliningrad Province) 1. O. lineare
One of the very few examples
of an alien invasive moss species in the Northern Hemisphere. Indigeneous to the Southern Hemisphere, O. lineare was
introduced into Europe (initially England) at the beginning of the
20th century and has subsequently been found in many northern and
central European countries. In 1990 it was first recorded in
Kaliningrad Province as new to Russia. It remains a rare species
there, apparently without the ability to spread further eastwards. The species grows on rotten logs, tree bases and decayed litter in
pine plantations. It can be recognized by its straight, elongate
capsules and delicate peristome of narrow teeth and segments.
— Leaves bordered with
linear cells; exostome teeth absent and peristome elements formed
from delicate and fragile endostomial segments with partially
adherent exostomial material; mountains in the southern regions of
Siberia and Russian Far East 2. O. lignicola
This species is known from
China (Sichuan, Yunnan), Mongolia (Hubsugul area), India (Sikkim),
Nepal and from South Siberia from the Altai to Khabarovsk
territories. It occurs in the mountains in a narrow altitudinal belt
a little below the tree line, where fallen trunks of Larix and
Pinus sibirica decay quite slowly due to the cold environment
and snow is occasional in summertime. Orthodontium lignicola
prefers overhangs of logs and hollows in wood from root side. It
is a very rare species in protected areas, while outside of them
even moderate human impact reduces the abundance of substrates. Intentional searching in many apparently suitable locations was not
successful.