430 Proceedings of the Royal Irish Academy. 
69^*. Thutidium. Scliimp. 
Scarcely differing from Hypnum, but distinguished principally by the 
widely creeping stems, which are covered with short villi, 
and furnished with doubly or triply pinnated branches, and 
by the leaves being papillose and more or less plaited. 
Diagnosis of Species. 
Stems simply pinnate, clothed with short 
villi ; nerved almost to the apex ; leaves 
papillose on the back their margins re- 
flexed, capsule cylindrical, inclined; 
lid conical. Inflorescence dioicous, 
Stems interruptedly tripinnate ; leaves ser- 
rate, papillose on the back, those on 
the stem cordate- acuminate, nerved 
almost to the apex, branch -leaves ovate 
with a short single or double nerve, . 
« 
1. T. abietinum (Linn.). Sp. PL, p. 1591. EryoL Europ., vol. v. 
p. 9, tab. 485. Schimp., Synops. Muscor., p. 409. Eabenhor., 
Bryothec. Europ., I^o. 770. Hypnum abietinum, Bryol., 
Brit., p. 377, tab. 25. Hook, and Tayl., Muscol. Brit., p. 
174. 
Hab. On sandy ground near the sea coast. Portmarnock sands, 
Malahide and Portrane, Dublin ; BelmuUet, and near Killala, 
Mayo. Bare in Ireland. 
2. T. tamariscinum (Hedw.). Sp. Muse, p. 261, tab. 67, f. 1-5, 
Bryol. Europ., voL v. Monogr., p. 7, tab. 482, 483. Schimp., 
Synops. Muscor., p. 498. Hypnum tamariscinum, Bryol. Brit., 
p. 380, tab. 57. H. proliferum, Hook, and Tayl. Muscol. 
Brit., p. 171. Engl. Bot., tab. 1494. 
Hab. "Woods and shady banks. Abundant in many paits of the 
country. 
Sub-tribe. Gamptotheciece. 
70. Hypnum. Linn, et Hillen. 
Calyptra dimidiate, small, fugacious. Capsules more or less ovate, 
sub- cylindrical or unequal, generally arcuate -cernuous. Peris- 
tome double, the exterior of 16 linear lanceolate teeth, trabecu- 
lated, and marked by a medial line ; inner peristome a mem - 
brane divided half way down into 1 6 carinated processes or cilia, 
alternating with the outer teeth ; intermediate ciliolse present 
1-3 together between each pair. Inflorescence monoicous, dioi- 
cous, or polygamous. 
1. T. ABIETINUM. 
2. T. TAMARISCINUM. 
