374 
Proceedings of the Royal Irish Academy. 
4. T. tophaceiim (Br. et Schimp.). Bryol. Europ., vol. ii. Monogr., p. 
9, tab. 175. Bryol. Brit., p. 113, tab. 20. Lindberg, Trichost. 
Europ., IN'o. 10, p. 17. Rabenlior,, Bryotbec. Europ., No. 558. 
Didymodon tiifarium, Hook, and TayL, Muscol. Brit., Ed. 2, 
p. 118, tab. 20. 
Hab. On wet clay banks and on rocks. Frequent in Counties of Dub- 
lin and Wicklow; Connemara, Galway; in ''The Glens," Antrim; 
Cork, Isaac Carroll ; and many other parts of Ireland. 
33. DiTEiCHiJM. Timm. 
Calyptra elongate. Capsule pedicellate, ovate or oblong, erect. Pe- 
ristome similar to that of Trichostomum, teeth filiform, approxi- 
mated in twos or threes. Leaves mostly subulate from a rather 
broad base, which is partially amplexicaul, secund or falcate, 
shining with a silky lustre when dry. Small mosses differ- 
ing from Trichostomum more in appearance than in any real 
characters. 
Diagnosis of Species. 
Inflorescence dioicous. 
Stems loosely coespitose ; leaves spreading or 
secund, lanceolate -subulate ; nerve ex- 
curent, . . . . . . 1. D. pusillum. 
Stems short, not matted; leaves spreading, 
subulate, setaceous ; nerve broad, excur- 
rent, . . . . . . . 2. D. homomallijm. 
Stems elongated, densely coespitose, and 
flexuose; leaves secund at apex of 
shoots, . . . . . . 3. D. FLEXICAULE. 
1. D. pusillum (Timm.) Prodromus. Elor. Megapolitana, p. 216. 
Trichostomum pusillum, Hedw. Stirp. 1, p. 74, tab. 28. Engl. 
Bot., tab. 2380. T. tortile, Bryol. Brit., p. 115, tab. 43. 
Leptotri chum tortile, Hamp. in Linnaea, 1847. Schimp., Synops. 
Muscor., p. 143. Briol. Ital., p. 516. Rabenhor., Bryothec. 
Europ., No. 424. 
Hab. Sandy banks, quarries, &c. Near Belfast, Hrummond. In 
the late Mr. Templeton's Garden, Cranmore, Belfast, 1837, 
Dodge's-glen, Cork, D. Murray and Isaac Carroll. Bare 
in Ireland. 
