C. hymenophylloides
This
species is conspicous and can be recognized by its
complanate-foliate, pale- or glaucous-green leaves that are so
strongly narrowed to the base that they appear to be attached to
stem by only the costa. Cyrtomnium
hymenophylloides
usually grows
in rock crevices or on sheltered cliff surfaces; it occurs in
continental areas with calcareous bedrocks and grows abundantly in
mountain tundra regions, often in association with Orthothecium
chryseum.
— Shoots
terete-foliate; leaves acute, moderately narrowed to the base,
decurrent; costae occupying less than 1/3 of leaf base; marginal
leaf borders with 1–2(–3) rows of relatively broad cells with
moderately oblique end walls 2. C. hymenophyllum
Cyrtomnium
hymenophyllum is
similar to C. hymenophylloides in
having glaucous colored plants. Furthermore, fertile (male) plants
of C. hymenophylloides
are sometimes
terete-foliate and this may cause problems in separating the two
species. But, the presence of some or many complanate-foliate plants
in large populations of C. hymenophylloides is
always apparent. The presence of broadly decurrent leaves allows for
the reliable recognition of C. hymenophyllum in the
field. Cyrtomnium
hymenophyllum has a
mainly Arctic distribution with scattered localities in other cold
regions of Russia, mainly within the permafrost zone.