478 BRYOPHYTA. 



[he columella, around which the spore-sac is developed, usually sep- 

 arated from the walls by air-spaces aud chlorophyl-bearing tissue. 

 Capsule splitting regularly by a lid or slits, or breaking irregularly ; 

 when regular, frequently developing teeth around the mouth, form- 

 ing the peristome, which serves in the protecting and scattering of 

 the spores. 



Order 1. BRYALES. 



Protonema usually filamentous; calyptra apical; pedicel more or less 

 elongated, apical or lateral; capsule generally with a well-developed lid; 

 peristome present or absent, neck usually with stoiuata. 



A. Acrocarpous Mosses: Main stems erect, simple or branching; capsules terminal on 



the stems. 



1. Plants pale green, almost white, leaves often iridescent ; vein wider than the 



blade of leaf, blade often lacking. Fain. 1. LEUCOBKYACEAE. 



2. Plants bright or dark green ; rein narrower than the 



blade of leaf. 



a. Leaves two-ranked, with the blades duplicated 



on one side at base. Fam. 2. FISSIDENTACEAE. 



b. Leaves not two-ranked, blades not duplicated at base, more or less equilateral. 



* Species only known from sterile specimens in the Bahamas. 

 Propagating by gemmae or brood-bodies. 



Brood-bodies borne in clusters at the summit of longer apical leaves. 

 Calymperes Richardi in Fam. 3. CAXYMPERACEAE. 

 Brood-bodies borne on filaments in the axils of the upper leaves. 



Hyophila and Burbula in Fam. 4. TORTULACEAE. 

 Not propagating by gemmae or brood-bodies. 



Costa thickened and spinose above, ending below the coarsely toothed. 



apex. Syrrhopodon Gandichaudii in Fam. 3. CALYMPERACEAE. 



Costa thick but not spinose, ending below the minutely toothed apex. 



Desmatodon Garbcri in Fam. 4. TOETULACEAE. 



Costa not thickened nor spinose, ending in the inucronate apex. 



Trichostomum in Fam. 4. TOETULACEAE. 

 * Species usually fruiting. 



t Peristome and annulus none. 



Leaves papillose above with minute papillae. 



Hymenostomum flaccscens in Fam. 4. TORTULACEAE. 

 Leaves not papillose. 



Macromitrium mucronifolium in Fam. 5. ORTHOTRICHACEAE. 

 tt Peristome and usually the annulus present. 

 } Peristome single, annulus double. 

 Teeth erect, not twisted. 



Qyroweisia Barl>ula in Fam. 4. TORTULACEAE. 

 Teeth inclined, twisted 1-2 times. 



Tortulu atjraria in Fain. 4. TOETULACEAE. 

 JJ Peristome double. 



Capsule erect, the lid beaked : teeth erect, not twisted, deeply 

 inserted ; annulus none. 



Schlothcimia in Fam. 5. ORTHOTRICHACEAE. 

 Capsule nodding, lid not beaked : annulus double. 



1. Teeth oblique, with apical appendages and united to a 



disc. Fam. 6. FTJNARIACEAE. 



2. Teeth erect, without appendages and not united at apex. 



Fam. 7. BRYACHAB. 



B. Pleurocarpous Mosses: Main stems procumbent; capsules terminal or lateral on the 



branches. 



1. Fruit unknown in the Bahamas : 



Propagating by brood-bodies, borne in clusters in the axils of the leaves. 

 Leaves minutely papillose, with small papillae terminal on each cell. 

 Margins revolute, entire, the vein ending below the apex. 



Leiicodontopsis in Fam. 8. LEUCODONTACEAE. 

 Margins flat, serrulate, the vein ending at apex. 



Pircclla in Fam. 9. NECKERACEAE. 



Propagating by brittle terminal buds and slender branchlets : leaves papillose, 

 with several central papillae on each cell. 



PapiJlaria in Fam. 10. METEORIACEAE. 



2. Fruit on elongated, erect pedicels ; peristome double. 



a. Capsules erect and symmetric. 



Stercophyllum in Fam. 11. E 1 ? TODONTACEAE. 



