The English flora - SeaweedAfrica

MUSCI.
16. Didymodon. Peristome of 16 or 32 teeth, approaching
in pairs or united at the base. Calyptra dimidiate.
17. Trichostomum. Peristome of 16, equal teeth, divided
to the base, or 32 placed together in pairs. Calyptra mitriform.
18. Glyphomitrion. Capsule destitute of apophysis. Peristome
of 16 teeth, approximated in pairs, reflexed when dry.
Calyptra covering the whole capsule, entire or rarely cleft on
one side and laciniated.
19. Dicranum. Peristome of 16, bifid, equidistant teeth.
Calyptra dimidiate, not fringed at the base. (In some species
of the first division the seta is lateral.)
20. Tortula. Peristome of 32, spirally twisted teeth, more
or less united at their base into a tubiform membrane.
21. Cinclidotus. Peristome of 32, filiform, at length twisted
teeth, anastomosing at their base.
22. Polytrichum. Peristome of 32 or 64 equidistant teeth,
united at the extremity by a horizontal membrane. Calyptra
dimidiate, very small.
(See Entosthodon and Orthotrichum in Diploperistomi.)
Div. II. Peristome double. Diploperistomi.
A. Internal peristome composed of distinct teeth or cilia, (in
Entosthodon obsolete.)
23. Entosthodon. Peristome double (?) ; the outer of 16 remote
(horizontal and slightly oblique) teeth, from within the
mouth of the capsule ;
an apophysis.
inner obsolete or wanting. Capsule with
24. Funaria. Peristome oblique; the outer of \6, compact
teeth; the inner of as many cilia opposite to the teeth of the
outer. Capsule pyriform, its mouth oblique.
25. Zygodon. Outer peristome of 16 teeth, approaching in
pairs J the inner of 8 or 16 horizontal cilia. Calyptra dimidiate.
•2(). Ohtiiotkk him. Outer peristoma of 16 teeth, approach'
'
ing in pairs; the inner of 8 or 16 horizontal cilia, (sometimes
wanting),
Calyptra mitrifonn. Bulcate.
B. Inner peristome formed of a membrane more or lest divided into
liHutia or segments*
27, Him m. Outer peristome of 16 teeth; lacinia of tin-
inner hi, equal, frequently with filiform processes placed between
them. Calyptra dimidiate,
4
3*