190 NEW BRITISH MOSSES. 
brace), and having the nerve bent almost at a right-angle at 
the point of greatest concavity, their margins reflexed above 
and denticulate, their points recurved and diaphanous, their : 
nerve slightly excurrent; the intermediate leaves resemble 
those of the perichætium except in being smaller and less 
concave. Inflorescence monoicous ; male flowers gemmiform, 
one or two arising from near the base of the plant, each con- 
sisting of 3 or 4 minute obovato-lanceolate nerveless leaves, 
sometimes unequally bifid or even trifid, including 2 anthe- 
ridia, destitute of paraphyses. Vaginula small. Calyptra 
minute, diaphanous, covering a very small portion of the 
capsule, subdimidiate, usually remaining in adhesion to the 
capsule by its entireside. Pedicel very slender, curved at an 
early stage, but gradually raising itself erect as the capsule 
advances towards maturity, suddenly bent at a right angle at 
its junction with the capsule. Capsule large, obsoletely 
rostellate and the axis considerably depressed when young, 
but when fully grown spherical and the axis very nearly ho- 
rizontal. Seeds rather large. 
The only species for which this beautiful and interesting 
Phascum can be mistaken is Ph. muticum. The latter is 
however, admirably distinguished by the perichetial leaves 
being only #wo (not three) in number, strongly convolute and 
not keeled, their margins plane, their nerve never running be- 
yond the point, and their areolation 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 monoicous. 
To Mr. Wilson I am indebted for the information that 2c 
Phascum triquetrum is published in Drummond's Musti 
Americani as Ph. muticum: he says * Your new Phascum I 
have never seen before, as British, but I know it partially a5 — 
No. 8, (Ph. muticum), of Drummond's Musci Amer., though} — 
had not ventured to separate it from Ph. muticum.” He has also 
kindly examined the mosses preserved under the name of PA. 
muticum in the Hookerian Herbarium, and finds Ph. triquetrum 
** gathered near Cagliari by Müller and distributed by the Unio 
Itineraria under the name of * Ph. muticum, many years ag- 
