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Leaves of male plants sometimes obtuse. Tufts very tomen- 

 tose to the green tops, often high. — Wet rocks r. Amer, 

 Pacif. distr. Can.: Macoun. U. S.: Roell; Henderson, com. Cardot. 

 tDichodontium olympicum Eenauld et Oardot (ined.). Leaves very 

 papillose, minutely denticulate nearly all around; capsule strumose. 

 — U. S. Wash.: Hendersom: Oardot iu Musci Amer. sept. — Speci- 

 mens not seen. 



9]. Dicranum Hedwig. 



A. Capsule straight (in D. hyperboreum faintly oblique) not 

 strumose. Leaves not undulate; cells gen. not porose. 



a> Monoecious. Leaves- entire us. small. Pedicel of cap- 

 sule not long. Stem gen. without rhizoids above base. 



I. Arctoa. Leaves channelled: alar cells us. distinct; costa 

 narrow more or less excurrent. Capsule not large; teeth often 

 spreading when dry; pedicel short-emergent. 



II. Metzleria. Leaves convolute above; alar cells not well- 

 defined; costa very broad long-excurrent. Capsule small; teeth 

 not spreading; pedicel exserted. Plants small. 



b. Dioecious. Leaves sometimes denticulate us. large. Pe- 

 dicel of capsule long. Stem radiculose also above base. 



aa. Leaves with narrow or not very broad costa; alar cells 

 persistent. 



in. Orthodicranum. Leaves channelled or convolute above; 

 upper cells subquadrate. Pedicel of capsule straight; peristomial 

 teeth cleft. Tufts us. green. 



Ibb. Leaves with very broad long-excurrent costa. 



IV. Paraleucobryum. Leaves subconvolute above, persistent; 

 alar cells persistent us. brown, the others few short-rectangular; 

 costa thick formed by 3 layers as in Leucohryum glaucum, middle 

 layer consisting by small green cells. Pedicel of capsule straight; 

 teeth often partite. Tufts whitish green. Calyptra very long. 



V. Pseudo-Campylopus. Leaves channelled persistent; alar 

 ceUs persistent brown, the others numerous rectangular; costa 

 not thick. Pedicel of capsule straight; teeth cleft. Tufts green 

 or brownish. 



VI. Dicranodontium. Leaves channelled soon deciduous; alar 

 cells fugitive pale, the others numerous rectangular; costa not 

 thick. Pedicel of capsule arcuate; teeth often partite. Tufts 

 green or brownish. 



B. Capsule curved or oblique sometimes strumose. Leaves 

 often undulate when dry; cells often porose. 



VII. En-Dicranam. Peristomial teeth cleft. Leaves with 

 narrow or not much broad costa. 



