Moore — On the Mosses of Ireland. 
441 
32. H. {Amllystegium) irriguum (Wilson). Bryol. Enrop., vol. vi. 
Monogr., p. 11, tab. 566. Schimp., Synops., Muscor., p. 594. 
Rabenhor., Bryothec. Europ., No. 766. Hypnum irriguum, 
Bryol. Brit., p. 361, tab. 25. 
Hab. Borders of lakes, &c. Among the roots of willows, covered 
partly with, water, in a stagnant part of the lake at Rocking- 
ham, Roscommon, May, 1871. This is the only locality at 
present known to me. 
33. H. {Amhlystegium) fluviatile (Swartz). Bryol. Europ., vol. 
VI., SuppL, p. 1, tab. 567. Hypnum fluviatile, Swartz, 
Muse. Suec, p. 68. Web. et Mohr, Bot. Tasch., p. 203. 
Hedw., Sp. Muse, p. 227, tab. 81, f. 4. Bryol. Brit.,;^p. 359, 
tab. 55. Rabenhor., Bryothec. Europ., 'Eo, 1094. 
Hab- On rocks and stones in rivers and streams. On rocks in the 
river at Ballinhassig, near Cork, Taylor, in El. Hib. 
34. H. {Amblystegium) serpens (Dill.). Bryol. Europ., vol vi., 
Monogr., p. 9, tab. 564. Schimp., Synops. Muscor., p. 591. 
Hypnum serpens, Bryol. Brit., p. 362, tab. 24. Turner, Muse. 
Hib., p. 168. Engl. Bot., tab. 1037. 
Hab. On walls, rocks, and among roots of trees. Abundant every- 
where through Ireland. 
35. H. {Amhlystegium) riparium (Linn.). Bryol. Europ., vol. vr. 
Monogr., p. 14, tab. 570, 571. Schimp., Synops. Muscor., p. 597. 
Rabenhor., Bryothec. Europ., No. 482. Hypnum riparium, 
Bryol. Brit., p. 364, tab. 24. Engl. Bot., tab. 2060. 
Hab. On wood, and stumps of trees by the sides of rivers, &c. Fre- 
quent and generally distributed. 
Sect. Limnohium. Bryol. Europ. 
Main stems mostly prostrate, irregularly branched. Leaves varying 
in form, generally roundish, and rather obtuse, entire, slightly 
two-nerved or nerveless, cellules oblong or linear. Capsule 
cernuous ; operculum hemispherical, apiculate, or shortly conic. 
Diagnosis of Species. 
Inflorescence monoicous. 
Leaves secund or imbricated, ovate- acumi- 
nate, apiculate, concave, entire ; their 
margins incurved above, nerve short, 
sometimes forked at the base, . . 36. H. palustre. 
R. I. A. PROC. — VOL. I., SER. II., SCIENCE. 3 L 
