— 245 — 
— 48.marginata Britton. 
Leaves narrowly ovate-lanceolate channelled or faintly cari- 
. nate above, serrate at the obtuse acumen, blackish and nearly 
. appressed when dry; nearly all cells uniform subquadrate exc. 
. the outer rectangular near borders; uppermost cells more opake. 
— Perichetial leaves similar but longer acuminate. — Rocks above 
— the waterline r. Amer. U. S. Calif: Marshall A. Howe. 
Fam. 24. Weisiacee. 
109. Barbula Hedwig. 
= Å. Basal tube of peristome elongate. Pedicel straight. 
I. Syntrichia. Peristomial legs us. contorted. 
1. Ruraliformes. Leaves us. lingulate-spathulate, with 
. hairpoint (exe: B. mutica); basal cells us. long. Us. dioecious. 
2. Subulateformes. Leaves oblong-lanceolate or sublinear 
— lingulate without hairpoint; basal cells long. Monoecious. 
8. Canescentes. Leaves ovalovate without hairpoint; basal 
- cells short. Monoecious. Plants small and low. 
= B. Basal tube of peristome very short or indistinct. 
a. Leaves mamillose. Peristome sometimes not contorted. 
Pedicel straight or curved. 
IL. Timmiella. Leaves long sublinear, often serrulate above, 
neither reflexed nor limbate, curled when dry; basal cells rect- 
angular; costa r. excurrent. Capsule cylindric often large. : 
b. Leaves papillose.  Peristome not contorted. Pedicel 
straight or curved. | 
II Zygotrichia. Leaves ovate-oblong or ovate-lanceolate 
reflexed r. with hairpoint; basal cells large rectangular. 
1. Orthopodiz.  Pedicel straight. Spores about 0,02 m. 
m. Leaves not limbate. : 
.2. Camptopodiz.  Pedicel arcuate when moist. Spores 
about 0,04 m. m. Leaves broadly yellow-limbate. | 
€. Leaves papillose or smooth. Peristome us. contorted. 
Pedicel straight. | Be T, 
caa. Capsule placed on short lateral branches. Leaves 
broadly limbate below by narrow hyaline cells, serrulate above. 
IV. Pleurochzste. Leaves not reflexed, eurled when dry; 
costa not excurrent. Peristome much contorted. Dioecious. 
bb. Capsule terminal Leaves gen. entire r. denticulate, 
us. curled when dry. ! : 
V. Tortella. Leaves neither reflexed nor limbate, from dila- 
ted base gen. longly acuminate, without hairpoint; basal cells 
