lowed out upwards as it were for the reception of the capsule
(which they closely embrace), and having the nerve at the
point of greatest concavity bent at nearly a right angle, the
margins reflexed above and denticulate, the points recurved
and diaphanous, the nerve excurrent; the intermediate leaves
resemble those of the perichaetium, except in being smaller
and less concave. Inflorescence monoicous; male flowers
gemmiform, one or two in number, arising from near the base
of the plant, each consisting of three or four minute obovato-
lanceolate, nerveless leaves, sometimes bifid or even trifid,
including two antheridia, destitute of paraphyses. Yaginula
small. Calyptra minute, diaphanous, covering a very small
portion of the capsule, subdimidiate, usually remaining in adhesion
to the vaginula by its entire side. Pedicel very slender,
curved at an early stage, but gradually raising itself erect
as the capsule.ripens and enlarges, suddenly bent at a right
angle at its junction with the capsule. Capsule large, obso-
letely rostellate and the axis considerably depressed when
young, but when fully grown perfectly spherical, and the axis
very nearly horizontal. Seeds rather large.
P. muticum, though closely allied to P. triquetrum, is well
distinguished from it by the perichaetial leaves being only two
in number, strongly convolute and not keeled, the margins
plane, the nerve never running beyond the point, and the areo-
lation closer than that of P. triquetrum. Besides, the pedicel
is shorter and stouter, the calyptra campanulate, the capsule
smaller and quite erect, the seeds are smaller, and the inflorescence
is dioicous.
P. triquetrum differs essentially from P. Floerkeanum and
all its affinities, in the absence of a beak from the capsule.—
R . S p r u c e .