— 274 — 
Perichetial leaves with excurrent costa. Annulus simple. E 
Eur, r. France: Philibert; Goulard. bite) 
*D.pallidisetus H. Mueller. — Trichostomum H. M; Didy- — 
modoa Kindb. Td 
Leaves plane below, the perichetial with percurrent costa. | 
Capsule. finally striate; annulus simple; pedicel wholly pale — 
yellow. — Eur. r. Germany: Geheeb. b». 
2. Crispuliformes. neu E 
A. Leaves carinate from dilated undulate base gradually — 
subulate. Habit of Barbula (Tortella). R. fruiting. HOR C 
3.D.eylindrieus Bruch. — Weisia Bruch; Didymodon Br. eur. 
Leaves long narrow acute or subobtuse, sometimes sparingly 
denticulate near apex; basal cells hyaline; costa not excurrent. 
Capsule cylindric. Tufts dark green. — Siliceous rocks. Eur. 3 
not common. Switzerl.! Sweden: Lindberg. Amer. Can.: Ma- vr 
coun, 
4.D.hibernicus Mitten. — Tortula Mitt.; Didymodon Kindb. 
Differs from the last: Leaves entire acute more dilated at — — 
base; basal cells abruptly passing to the rounded green ones. ! 
Stem often very long. — Wet rocks r. _ Eur. Ireland: Stewart | 
and Holt. preeu ii 
B. Leaves not carinate, sublinear or with sublinear or subu- - 
late acumen, entire. Mu 
a. Leaves channelled or involute; basal cells us. yellowish, 
upper very small opake papillose. oto. 
5.D.brachydontius Bruch. — Trichostomum Bruch; Didymodon ix 
Wilson; Trichostomum mutabile Notaris. m 
Leaves sublinear or narrowly. ovate-lanceolate gen. acute, - 
sometimes ovate-oblong short-acuminate, not channelled near. 
apex; basal cells brownish or yellowish; costa excurrent. on 
sule oval-oblong or subeylindric; teeth smooth us. short am 
gular; pedicel yellow. Tufts loose 1—2 c. m. high or lower. 
— Caleareous rocks. —. Eur. Switzerl.! Sweden: Zetterstedt; 
P. Larsson; Belgium: | Roemer. France: Philibert; Brébisson. 
6.D-luteseens Lindberg. - Mollia‘ Lindbs Didymodon Kindb. 
Differs from the last: Leaves smooth pellucid longer-apiculate; 
upper cells : better defined. Tufts yellowish green. Ca in 
unknown. — Fissures of limestone rocks r. — Bur. »lrel: 
Lindb.»: Braithwaite, dete 
7.D.crispulus Bruch, — Trichostomum Br.; Didymodon Wilson. ^ 
Leaves from Subovate base sublinear or r. suboblong, short- 
attenuate often subobtuse, distinctly channelled or involute; 
