Mironia is a Neotropical,
high elevation genus. Its species have a characteristic reddish color, leaves
when wet that are spreading from an erect-sheathing base, long, cylindric
capsules, and well-developed, spirally twisted peristome teeth. It is very
similar to Bryoerythrophyllum and Rhexophyllum which differ from Mironia
in having leaves that are either unistratose at the margins (Bryoerythrophyllum)
or irregularly bistratose throughout the lamina (Rhexophyllum). Rhexophyllum
also differs from Mironia in having a stem hyalodermis. The distinctions
between the three genera, however, are blurred by the presence of bistratose
upper leaf cells in some Bryoerythrophyllum species and some collections
of M. elongata (first noted by Bartram 1955).
Leptodontium is similar to Mironia
in plant size, leaf shape and in having species with dentate upper leaf
margins. It differs from Mironia in its usually yellowish green color,
unistratose leaf margins, peristome of 16 erect teeth, and the absence of a
stem central strand.