Moore — On the Mosses oj Ireland. 
425 
Tribe 14. HYPNEiE. 
Sub-tribe. Isotheciem. 
64. Pterogonium. Scbwartz. 
Calyptra cucullate, deeply split at the side. Capsule on an elongated pe- 
dicel, oblong, thick ; lid rostellate. Peristome double ; outer of 
16 short, slightly hygrometric teeth; inner cilia 16, short, 
slender, partially adherent to the outer teeth. Leaves ovate- 
acuminate, shortly bicostate at base ; areolation _ rather dense, 
composed of hexagonal cellules. Inflorescence dioicous. 
Diagnosis of Species. 
Stems with fascicled incurved branches ; leaves 
broadly ovate- acuminate, concave, their 
margins plane, serrulate near the apex, 
faintly two-nerved ; capsule oblong ; lid 
conical, 1- gRACile. ; . : 
Leaves subsecund, ovate, subacuminate, con- 
cave, papillose, serrulate at the apex; 
capsule elliptic-oblong ; lid rostrate, . 2. R filifoeme. 
1. P. ^r«^!^76 (Schwartz.). Muse. Suec, p. 26. Schimp., Synops. 
Muscor., p. 500. Bryol. Brit., p. 321, tab. 14. Hook, and 
Taylor, Muscol. Brit., p. 74. Eabenhor., Bryothec. Europ., 
ISTo. 686. 
Hab. Eocks and large stones in hilly parts of the country, especially 
near the borders of lakes, as at Lough Bray and Luggielaw, 
Wicklow. This moss occurs in most of the counties of Ire- 
land. 
2. P. filiforme (Schwaegr.) Suppl. 1, p. 100. Bryol. Brit., p. 
320, tab. 14. Hooker and Taylor, Muscol. Brit., p. 75. 
Pterigynandrum filiforme, Bryol. Europ., vol. v. Monogr., p. 
3, tab. 460. Schimp., Synops. Muscor., p. 508. Briol. ItaL, 
p. 219. Eabenhor., Bryothec. Europ., I^To. 637. 
Hab. Dry rocks in shaded woods. Erequent, particularly in 
the upland districts. 
65. IsoTHECiTJM. Bridel. 
Calyptra cucullate. Capsule ovate, of thick texture, erect, and symme- 
trical. Peristome double ; outer teeth 16, trabeculated, and marked 
with a medial line ; inner peristome of 1 6 carinate, lanceolate-subu- 
late cilia, with cilioloB present. In all respects similar to Hypnum, 
except in the erect symmetrical capsules, and differing from Ptero- 
gonium in the more perfect development of the peristome and 
annulus. (Wilson). 
R. T. A. PROC. — VOL. I., SER. II., SCIENCE. ^3 I 
