ior> 



A . tristis. 



Leaves imbricate wiicn dry, s(|uarrosc when moist, apiciilate. Costate 

 to tlie middle, costa narrow. I'"niit lias never been reported. 

 Brachytiiecxum. 



The macroscopic determination of this genus lies mainly in the capsule, 

 which is short ovoid, and rather thick, of a rich brown color. The capsule 

 is with few exceptions horizontal or inclined. The leaves are costate more 

 than half way. Plants usually large, forming loose mats. Branching 

 irregular. The seta may be smooth or rough. 

 B. acuminaium. 



This form has a rather varied hal)itat, and is found on stones and rock 

 as well as on earth in deep woods. The capsule is almost erect, seta 

 smooth. The leaves are costate, serrate, acuminate, striate, concave. 

 Costa ending about the middle. Plants dark green or glossy, of medium 

 size. Mature in autumn. 

 B. cyrtopkyllum. 



Seta smooth as in the above, leaves subjulaceous, slender. Branch 

 leaves ovate, concave, margin reflexed. Plants slender, caespitose, 

 glossy to dark green. Mature in autumn or spring. 

 B. oxycladon. 



Capsule suberect. Leaves plicate. Plants yellow, shining green. 

 B. pliimosum. 



One of our most common Brachytheciums. Found on soil, stones, 

 rock. Leaves costate, serrate acuminate, leaves not plicate, ovate 

 lanceolate, concave, decurrent, closely imbricated. Capsule light brown 

 when young, black when old. Seta rough above, smooth below. Plants 

 forming large dense mats, robust, yellow green, densely foliate. Stem 

 prostrate. Branches erect or curved. Mature in winter. 

 B. rivulare. 



Aquatic or subaquatic, on stones in brooks. Leaves costate, serrate, 

 acuminate,, large open ovate, costate almost to the middle. Capsule 

 cernuous. vSeta rough, long. Mats large, robust. Stems woody, 

 prostrate, dendroid in appearance. Mature in autumn. 

 B. salehrosum. 



Leaves costate serrate, acuminate, margins reflexed. Stem leaves ovate 

 lanceolate, plicate, close erect, imbricate when dry. Capsule inclined to 

 horizontal, cernuous, seta smooth. Plants form large j-ellow-green mats. 

 Stems pinnately branching. On stones, roots or trunks of trees. Mature 

 in autumn or winter. 

 Bryhnia. 



B. Novae-Angliae. 



Closely related to Brachylhecium. Leaves costate, serrate, acuminate, 

 decurrent, concave. Apex twisted. Branches subjulaceous, erect. 

 Costate to the middle. Operculum conic to short rostrate. Seta rough. 

 Plants rigid. 

 Calliergon. 



C. cordifoUum. 



Leaves distant, cordate, ovate, obtuse, decurrent, entire. Costate to 



