464 Proceedings of the Royal Irish Academy. 
Tribe 19. ANDRE^ACE^. 
79. Andre^ea. Ehrhart. 
Calyptra slender, membranaceous, mitriform, closely covering the cap- 
sule, and fugacious. Capsule oblong-oval, erect, sessile, or 
spuriously pedicellate, on the elongated perichsetium ; dehiscing 
by four longitudinal fissures at the sides, into four segments, 
which are united at the summit by the persistent apex or lid. 
Leaves imbricated, mostly of a brownish or blackish colour, 
ovate, ovate-lanceolate, or subulate, with or without nerves ; 
areolation dense on upper portion, larger and more pellucid 
at the base. Inflorescence monoicous or dioicous. 
This tribe differs from the typical mosses fully as much as the Sphagnese. 
In both the calyptra is severed in the centre by the growth 
of the ripening capsule, and not by the elongating fruit- stalk. 
The capsule also is in structure allied to that of some Hepaticse, 
except that the four valves are held together by the persistent 
lid. 
Diaynosls of Species. 
a. Leaves nerveless. 
Stems elongated, fastigiate ; leaves spathu- 
late, ovate -acuminate, concave, con- 
-tracted below the middle, . . . 1. A. alpi^^a. 
Stems short, branches fastigiate ; leaves ob- 
long-lanceolate, the upper falcate, se- 
cund, rather obtuse, papillose, . . 2. A. petrophila. 
aa. Leaves nerved. 
Stems very short ; leaves lanceolate-subu- 
late, falcate, secund, loosely imbricated, 
nerved to the apex, . . . 3. A. rupesteis. 
Stems prostrate, fragile, growing in rather 
dense tufts ; leaves crowded, falcate, se- 
cund, ovate-subulate ; strongly nerved, 
nerve filling the whole upper portion of 
the leaf, . . . . . . 4. A. CRAssmERViA. 
1. A. alpina (Dill.). "Wilson, Bryol. Erit., p. 11, tab. 8. Engl. Bot., 
tab. 1278. Eabenhor., Bryothec. Europ., No. 851. 
Hab. Mountain rocks. Abundant on Erandon, Kerry ; Upper 
Lough Bray, Wicklow ; Connemara, Galway. 
