DICRANACEAE. 



433 



Capsule with a simple peristome. 



A. Teeth 8 or 16, bifid or entire. 



Leaf-blade of one layer of cells. Fam. 



Leaf-blade of several layers of unlike cells. Fam. 

 Leaf with duplicate basal blades. Fam. 



Leaf with basal cells large and empty. Fam. 



B. Teeth lacking, 16 or 32, usually with a basal 

 membrane. 



Capsule with a double peristome. 



A. Pedicel terminal. 



Leaves with large cells, about as long as broad. Fam. 

 Leaves with cells usually longer than broad. Fam. 



B. Pedicel from lateral branches. 



Leaf-cells smooth, veins 2, ending near apex. 

 Leaf-cells more or less papillose, vein single. 



Leaves of two sizes, under leaves very small. Farn. 



Leaves of uniform size, clearly papillose. Fam. 

 Leaf -eel Is smooth, vein single or short and 

 double. 



Lid short, conic. Fam. 



Lid long, beaked. Fam. 



1. DlCRAXACEAE. 



2. LECCOBRYACEAE. 



3. FlSSIIiKXT.U-EAE. 



4. CALYMPERACEAE. 



Fam. 5. POTTIACEAE. 



6. FTJXARIACEAE. 



7. BRYACEAE. 



Fam. 8. HOOKERIACEAE. 



9. RHACOPILACEAE. 

 10. LESKEACEAE. 



11. HYPNACEAE. 



12. SEMATOPHYLLACEAE. 



Family 1. DICRANACEAE B. S. G. 

 DICRANUM FAMILY. 



Plants perennial, large or small, gregarious or crowded; stems branch- 

 ing dichotomousl}*, usually densely leafy and bearing radicles. Leaves 

 straight or curved, smooth or papillose; vein usually stout and percurrent, 

 sometimes ribbed on the back; basal cells usually pale and rectangular, 

 those of the basal angles often much enlarged and colored; upper cells 

 shorter, the walls often thickened, pitted and sinuous. Pedicel long, erect 

 or curved; capsule erect and symmetric or bent and curved, sometimes 

 furrowed; calyptra cucullate; lid conic, beaked; peristome single, tee'th 16, 

 usually bifid. About 48 genera, with some 1460 species widely distributed. 



1. CAMPYLOPUS Brid. 



Characters of the family. Leaves usually grooved or tubular, subulate and 

 often toothed at apex, sometimes with a paler hair-point. Pedicel usually 

 curved; capsule usually horizontal or nod- 

 ding; calyptra mostly fringed at base. 

 [Greek, in reference to the curved pedicel.] 

 A tropical genus of about 500 species. 

 Type species: Bryum flexuosum L. 



1. Campylopus bermudianus R. S. Wil- 

 liams. BERMUDA CAMPYLOPUS. (Fig. 472.) 

 Plants in dark green, loose tufts, stems 

 about 2i' high, branching, often with fla- 

 gellae; leaves often crowded at the apex, 

 mostly spreading all around, lanceolate, 

 grooved above, sharply serrate at the apes 

 and more or less serrulate on the margin; 

 vein broad, percurrent or slightly excurrent, 

 with prominent serrate lamellae 2 or 3 cells 

 high on the back above ; alar cells inflated, 

 the cells just above mostly rectangular, pale, 

 broad toward the vein, narrow toward the 

 margin, smaller above, with slightly thick- 

 ened walls rarely pitted near the vein. 



Paget Marsh, under palmetto. Endemic. 

 29 



