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4.S.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. — Rooks above 

 the water-line r. Amer. U. S. Calif.: Marshall A. Howe. 



Fam. 24. WeisiacBSB. 



109. Barbula Hedwig. 



A. Basal tube of peristome elongate. Pedicel straight. 

 I- Syntrichia. Peristomial legs us. contorted. 



1. Ruraliformes. Leaves us. Ungulate- spathulate, with 

 hairpoint (exc. B. mutica); basal cells us. long. Us. dioecious. 



'2. Subulataeformes. Leaves oblong-lanceolate or sublinear 

 Ungulate without hairpoint; basal cells long. Monoecious. 



3. Canescentes. Leaves oval-ovate 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. 



II. 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. 



III. Zygoti'ichia. Leaves ovate-oblong or ovate-lanceolate 

 reflexed r. with hairpoint; basal cells large rectangular. 



1. Oi'thopodiae. Pedicel straight. Spores about 0,02 m. 

 m. Leaves not limbate. 



2. Camptopodiae. Pedicel arcuate when moist. Spores 

 about 0,04 m. m. Leaves broadly yellow-limbate. 



C. Leaves papillose or smooth. Peristome us. contorted. 

 Pedicel straight. 



aa. Capsule placed on short lateral branches. Leaves 

 broadly limbate below by narrow hyaline cells, serrulate above. 



IV. Pleui'OChaete. Leaves not reflexed, curled 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 



