29. C e r a t o d o n . Capsule ovate-oblong, with a short struma. Teeth
biñd to near the base; segments narrowly linear, distinctly
articulate.
30. T r ic h o d o n . Capsule narrowly cylindrical, arcuate. Segments of
the teeth strongly nodose at tlie articulations.
78. C a t o s c o p iu m . Capsule very small, globose, incurved at the
collum. Teeth slioi-t, irregular. Calyptra very narrow.
76. C o n o s t om u m . Teeth connivent into a cone. Capsule ribbed.
6. Capsule more regular, slightly curved, somewhat pendulous on an
arcuate pedicel.
24. O am p y lo p u s . Teeth bifid to the middle. Calyptra fringed at
the base.
23. D i c r a n o d o n t iu m . Teeth bifid to the base; segments narrow,
linear. Calyptra not fringed.
c. Capsule erect, oval or somewhat pyriform.
13. W e i s i a . Teeth lanceolate, entire, truncate or dentate at the apex.
Capsule ova], smooth.
14. D i o r a n o w e i s i a . Teeth longer, lanceolate, distinctly articulate.
Plants large. Leaves arcuate or críspate.
16. R h a b d o w e i s i a . Teeth linear-subulate, enlarged at the base.
Capsule striate.
20. A n g s t r o em ia . Teeth laige, bifid to the middle. Capsule minute,
subglobose, .very long pedicellate. Male flowers discoid.
34. S e l i g e r i a . Teeth broad, lanceolate, obtuse, densely articulate.
Capsule pyriform. Plants very small.
35. B l in d ia . Teeth entire, lanceolate, acute, perforated or bifid at
the apex. Capsule inflated at the colluin, obovate or pyriform.
Plants of medium size.
54. D r u m m o n d ia . Teeth very short, truncate. Capsule globose-
oval.
64. D i s o e l iu m . Teeth lanceolate, distantly articulate, cleft between
the articulations. Calyptra split its whole length, remaining attached
to the pedicel.
73. B n t o s t h o d o n . Teeth distantly and strongly articulate, attached
below the orifice of the pyriform capsule.
82. M i e l io h h o f e r ia . Capsule pyriform -with a long collum, inclined
or pendulous. Teetli narrow from an enlarged base, strongly
articulate. Calyptra very small, fugacious.
d. Capsule erect, oblong or apopbysate.
61. S y r r h o p o d o n . Teeth entire, horizontal. Operculum subulate-
rostrate.
68. T e t r a p lo d o n . Teeth short, connate by fours at base. Capsule
with a long thick apophysis.
Teeth of the peristome 32.
= Teeth more or less connate their whole length.
40. D id ym o d o n . Teeth fiat, nairow, linear-lanceolate, confluent at
base, distantly articulate, rarely entire (16), generally split their
whole length'(32).
43. D e sm a t o d o n . Teeth entire (16) or cleft to the base (32); segments
papillose, tetragonal-terete, either free or connate by transverse
partitions; basiiar membrane protruding from t.ie orifice.
= = Teeth free.
42. T r ic h o s t o m u m . Teeth united in pairs to a narrow basilar
membrane; segments equal, filiform, more or less fragmentary.
41. L e p t o t r io h u m . Peristome as in the last; teeth longer, more
regular. Leaves long-subulate, glossy.
44. B a r b u la . Teeth very long, from a more or less broad tessellate
marginal membrane, twisted around the columella.
= = = Teeth large, adhering by their points to the tympaniform top
of 'the columella.
93. A t r io h u m . Calyptra spinulose at the apex, cuculiate.
94. O l ig o t r i c h u m . Calyptra large, covered with scattered hairs.
95. P s i lo p i lu m . Teeth long and slender, some of them bipartite.
Calyptra narrow, solid, smooth.
96. P o g o n a t u m . Calyptra densely hairy, covering the capsule,
mitrate.
« HH. +1. <-i. «. M. Teeth of the peristome 64.
97. P o ly t r i c h u m . Teeth adhering to the membrane, as in the last
' section. Calyptra densely hairy.
-I- s- Peristome double : its teeth 16.
•M. Capsule symmetrical, erect. Inner peristome of 8 or 16 cilia.
57. M a c r om i t rm m . Teeth lanceolate; inner membrane cleft or
truncate. Calyptra campanulate, plicate.
58. S c h l o t h e im i a . Teeth revolute, fleshy; inner peristome rudimentary
from a colored membrane. Calyptra campanulate, not
plicate.
59. E n o a l y p t a (3d Section). Teeth filiform; cilia similar to the
teeth. Calyptra very long, cylindrical or campanulate, not plicate.
56. O r th o t r io h u m (2d Section). Teeth 8, higeminate, or 16, geminate;
cilia filiform. Calyptra campanulate-mitrate, plicate,
smooth or hairy.
55. U l o t a . Peristome as in Orthotrichum. Calyptra yellow, hairy,
deeply split at tlie base, obscurely plicate.
If Capsule unsymraetrical, inclined to one side, oblique or pendulous.
= Inner peristome a plaited cone.
98. D ip h y s c iu m . Capsule gibbous, ovate, sessile. Plants small,
nearly stemless.
99. B u x h a u m ia . Capsule gibbous-ovate on one side, flat to convex
on the other, short-pedicellate.
= = Inner peristome a membrane cut into 16 segments; these sometimes
separated by cilia. Calyptra cuculiate.
74. P u n a r i a . Capsule short-pyriform, curved in the upper part.
Teetli obliquely curved; segments of the membrane entire or
rudimentary.
83. L e p t o b r y u m . Capsule pyriform, erect or pendulous. Segments
of the membrane separated by two appendiculate cilia. Leaves
narrowly lanceolate.
84. W e b e r a . Capsule long-pedicellate, cernuous or horizontal: cilia
none, rudimentary or perfect, not appendiculate. Leaves lanceolate,
glossy; areolation narrowly rhomhoidal; costa slender.