342 
Proceedings of the Royal Irish Academy. 
Tribe 18. Sphagne^. 
Mosses growing on turbaries, barren moors, or very moist ground i 
with erect or decumbent simple or forked stems, and fascicled 
branches, spirally disposed on the stems. .Leaves 5-ranked, 
obliquely inserted on the main stem, more crowded on the 
branches, nerveless ; areolation reticulated, larger cellules per- 
forated with minute pores, communicating with each other by 
intercellular pores, and lined with ;;spiral or annular filaments ; 
Capsules, globular and sessile from the centre of an upper fascicle 
of branches ; the perichsetal leaves ultimately elongating, and 
presenting the appearance of a lateral branch. Peristome wanting. 
Calyptra surrounding the ripe capsule, ruptured in the middle, 
the lower portion persistent, attached to the apex of the vaginula. 
Male flowers globose antheridia, inserted among the leaves at the 
apices of the branches. 
One genus, . . . . . . 78. Sphagivjum. 
Tribe 19. ANDEEiEEiE. 
Mosses growing in close tufts or densely gregarious ; with short stems, 
erect or decumbent at the base, branched in a dichotomous or 
fastigiate manner. Leaves imbricated, ovate-lanceolate, or sub- 
ulate, of a purplish brown colour, nerved or nerveless ; areolation 
dense and dot- like. Emit terminal ; capsule 4-cleft at the sides, 
or 5-valved, at first immersed among the perichsetal leaves, often 
shortly exerted. Calyptra mitriform, thin and fugacious, closely 
covering the capsule. 
One genus, . . . . . .79. Andre^a. 
DIAGI^OSIS OF GENEKA AND SPECIES. 
Tribe 1. Tethaphidf,^. 
1. Tetraphis Hedw, 
Setae terminal. Peristome single, with 4 teeth, equidistant, erect, 
striated on the back. Calyptra mitriform, irregularly plicate and 
lacerate at base. Male flowers terminal. 
1. T. pellucida (Hedw.). Species Muse, tab. 7, f. 1, Engl. Bot., 
tab. 1020. Bryol. Erit. p. 86, tab. 8. 
Hab. Dry banks at Lough Bray, Wicklow. Abundant at Crom- 
agloun, Killarney; and at 0' Sullivan's cascade, fruiting in 
September. Benbulben, Sligo. Glenariff, Antrim. 
Bather a rare Moss in Ireland, particularly so in a fruiting state. 
