338 
Proccediugs of the Royal Iriah Acadcnrij. 
nerves ; areolation for the most part small and quadrate in upper 
portion of leaf, larger, more lax and pellucid below. Capsules 
large, globose or subspherical, smooth or sulcate. Peristome nor- 
mally double, of 16 equidistant teeth ; inner peristome a membrane 
divided into 16 lanceolate processes, alternating with the outer 
teeth. Calyptra small, dimidiate, or cucuUate. Inflorescence synoi- 
cous, monoicous or dioicous. 
One Irish genus, . . . . . .47. Barteamia» 
Tribe 10. BiiYEiE. , 
Mosses with stems erect or decumbent at the base, simple or dichoto- 
mously branched. Leaves spreading regularly, rarely irregular ; 
areolation large in most instances, cellules rhomboidal or elongate. 
Capsules on long erect or decurved pedicells, oblong, pyriform, 
clavate or oblique, erect or pendulous. Peristome double, outer 
of 16 teeth ; inner of a membrane divided into 16 ciliary processes, 
alternating with the outer teeth ; or with peristome less perfect 
in the shortness or deficiency of the inner cilia. Calyptra small, 
fugacious, conoid or cucullate. Inflorescence synoicous, monoi- 
cous or dioicous. 
Genera. 
Peristome double, more or less perfect; male 
flowers rarely discoid, . . . .48. Bryum. 
Leaves dotted ; capsule oblong, sulcate when 
dry, . . . . . . .49. Aulacomnium. 
Plants annual; capsule pyriform, pendulous, . 50. Leptobeyum. 
Capsule oblong ; male flowers discoid, . .51. Mn-jum. 
Calyptra sub-inflated at base; leaves loosely 
reticulated, 52. Amblyodon. 
Tribe 11. Hookeeie^. 
Mosses with procumbent, decumbent, or suberect stems, dichotomous, 
irregular, or subpinnately branched. Leaves mostly complanate, 
variously -ranked, sometimes as many as 8 (10 Mitten), spreading 
laterally, with single and double nerves, the intermediate leaves 
appressed and often differently formed : areolation rather large, 
cellules elongate or rhomboid, smoother papillate. Capsules spring- 
ing from the main stem or lateral branches, on long or short 
pedicels, erect, or horizontally inclined ; lid rostrate. Peristome 
double, outer of 1 6 teeth, which are sometimes marked externally 
with prominent ridges ; inner peristome a membrane divided into 
16 processes, without intermediate cilia. Calyptra multifidatbase. 
