266 BRYACE^. \Polytrichum. 



6. P, COmniune, Linn. Plants very large, loosely cesiDitose, 

 dark red : leaves open, recurved, very long-sheathing, mem- 

 branaceous, whitish at base ; borders narrow, sharply and 

 densely serrate to the enlarged base; borders of the lamellae 

 papillose ; perichnetial leaves erect, very long-sheathing, awned : 

 calyptra very hairy, descending below the capsule : capsule 

 bhari)ly angled, long-pedicellate, light brown, horizontal when 

 dry and empty ; lid flattened-convex at base, conical-apiculate, 

 with red borders. — Spec. PL 1109 ; Bryol. Eur. t. 425. 



Var. perigoniale, Bruch & Schimp. Smaller, often bifid : 

 pericha3tial leaves all membranaceous, long-aristate : lid pale, 

 short-apiculate. — P. perigoniale, Michx. Fl. Bor.-Am. ii. 293. 



llAU. Bogs and woods ; plains and mountains. June. Very variable. 



Tribe XV. BUXBAUMIE.E. 



Small stemless ])lants, with large oblique ventricose capsules, 

 sessile or with short thick pedicels. Calyptra very small, con- 

 ical, smooth. Si^orangium pedicellate, small, attached by 

 filaments to the walls of the capsule. Peristome double, the 

 outer rudimentary, or composed of one or more rows of more 

 or less perfect teeth, the inner membranaceous, and forming 

 a truncate cone of 16 or 32 twisted folds. Spores very small. 



98. DIPHYSCIUM, Mohr. (PI. 3.) 

 Stems very short, simple, with numerous long radicles. Stem- 

 leaves Ungulate, thick, composed of a double stratum of cells, 

 costate, chlorophyllose ; areolation very small, round-hexagonal; 

 pei'icliJBtial leaves larger, ovate-lanceolate, thin, submembrana- 

 ceous, deeply serrate or lacerate-ciliate at the apex ; costa ex- 

 current into an awn. Flowers dioecious ; the male open, on 

 plants similar to the fertile ones, the paraphyses longer than the 

 antheridia ; the female gemmiform, with paraphyses shorter than 

 the long-styled archegonia. Vaginule formed of the thickened 

 upper part of the stem, bearing the perichsetium. Calyjitra 

 acute-conical, covering the lid. Capsule ventricose, ovate- 

 conical, yellowish green. Lid conical, acute. Outer peristome 



