62 BARTRAMIACEAE 



large papilla in the middle of each surface. Branches frequently 

 terminating in flagelliform pseudopodia bearing propagula at 

 their tips; calyptra cucullate; capsule oblong to subcylindric, 

 cernuous and usually somewhat unsymmetric, with a short 

 neck (so short as to be easily overlooked in some species), regu- 

 larly plicate or sulcate when dry. Annulus early deciduous. 

 Peristome perfect, as in Mnium. 



Leaves broad, apex rounded or acutish, strongly serrate; monoicous. 



heterostichum 

 Leaves lanceolate, acute, serrate or crenulate at apex; dioicous. . . .palustre 



A. palustre Schwaegr. Common everywhere in swamps!! 

 June. 



A. heterostichum (Hedw.) B. & S. Frequent, preferring soil 

 at base of trees in moist woods. May-June. 



Family 19. BARTRAMIACEAE (Plate V, Fig. 1.) 



Plants of medium or large size, usually growing in large deep 

 tufts or cushions on soil or rocks in moist shaded places; often 

 developing whorled innovations below the places where arche- 

 gonia or antheridia have been produced. Leaves strongly 

 costate to near the apex or beyond, acute, papillose (except 

 Bartramia Oederi), usually serrate. Leaf cells roundish-quad- 

 rate to rectangular. Calyptra small, cucullate; seta rather 

 shorter than in the related families; capsule nearly globular, 

 usually without neck, usually cernuous and somewhat unsym- 

 metric, regularly plicate or sulcate when dry; peristome double 

 in all our species; cilia frequently rudimentary or lacking; 

 segments split along the median line and the halves widely 

 divergent, sometimes appearing as if bordering the teeth. 



Key to Genera 

 Leaves elongated-lanceolate to linear-lanceolate; inner peristome with 



cilia rudimentary or lacking Bartramia 



Leaves much shorter, ovate-lanceolate; cilia present Philonotis 



PHILONOTIS Brid 



Our species of this genus are water-loving mosses, growing on 

 wet banks and rocks where water trickles, or on the margins 



