478 BBYOPHYTA. 



the columella, around which the spore-sac is developed, visually sep- 

 arated from the walls by air-spaces and 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; ealyptra apical; pedicel more or less 

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

 peristome present or absent, neck usually with stomata. 



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. Fam. 1. Leucobryaceae. 



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



blade of leaf. 



a. Leaves two-ranked, with the blades duplicated 



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



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



* Species onlv 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. 

 Cah/mperes Richardi in Fam. 3. Calymperaceae. 

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



Hyophila and Buvbula in Fam. 4. Tortulaceae. 

 Not propagating by gemmae or brood-bodies. 



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



apex. Syrrhopodon Gaudichaitdii in Fam. 3. Calymperaceae. 



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



Desmatodon Garberi in Fam. 4. Tortulaceae. 



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



Trichostomum in Fam. 4. Tortulaceae. 

 ** Species usually fruiting. 



t Peristome and annulus none. 



Leaves papillose above with minute papillae. 



Hymcnostomum flavcscens in Fam. 4. Tortulaceae. 

 Leaves not papillose. 



Macromitrium mucronifolium in Fam. 5. Orthotrichaceae. 

 ft Peristome and usually the annulus present. 

 J Peristome single, annulus double. 

 Teeth erect, not twisted. 



Gyrow&isia Barbula in Fam. 4. Tortulaceae. 

 Teeth inclined, twisted 1-2 times. 



Tortula agraria in Fam. 4. Tortulaceae. 

 %% Peristome double. 



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

 inserted ; annulus none. 



Schlothehnia in Fam. 5. Orthotrichaceae. 

 Capsule nodding, lid not beaked : annulus double. 



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



disc. Fam. 6. Fuxariaceae. 



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



Fam. 7. Bryaceae. 



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. 



Leucodontopsis in Fam. 8. Leucodoxtaceae. 

 Margins flat, serrulate, the vein ending at apex. 



Pireella in Fam. 9. Neckeraceae. 

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

 with several central papillae on each cell. 



Papillaria in Fam. 10. Meteoriaceae. 



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



a. Capsules erect and symmetric. 



Stereophijllitm in Fam. 11. Es todontaceae. 



