194 



MOSSES WITH A HAND-LENS 



Nerve. See costa. 



Oblong, broad, of the same width at both ends and longer 

 than broad. 



Ochrea, a thin sheath around the base of the seta, terminat- 

 ing the vaginula. 



Oosphere, the egg-cell or ovum found in the base of the arche- 

 gonium. (Fig. 5.) After fertilization, by union with the anthero- 

 zoid, it develops into the sporophyte. 



Operculum, the lid which closes the capsule and, falling, per- 

 mits the spores to. escape. (Figs. 8, 12, and 21.) 



Ovate, shaped like lengthwise section of an 

 egg, always broadest a little above the base. 



Pachydermous, thick-skinned; applied to 

 the walls of capsules or to cells when firm 

 and resisting. 



Papillae, minute rounded or acute protu- 

 berances. 



Papillose, rough with papillae. (Seta), 

 FIG. 23. rough with small rounded or acute protuber- 



ances. (Fig 23.) 



Paraphyllia, minute leaf-like or much-branched 

 organs among the leaves. (Fig. 24. E. g., Thuid- 

 ium. 



Paroicous, having its male and female organs in 

 the same cluster, but not mixed, the antheridia be- 

 ing in the axils of the perichsetial bracts below the 

 FIG. 24. archegonia. (Fig. 26.) 



Patent, spreading at an angle of 

 v 26-45 (Braithwaite) ; spreading 

 at an angle of 45 or more (Dixon). 



Patulous, more widely spreading 

 s. than patent. 



Pedicel. See seta. 



FIG 26. Pendulous, somewhat hanging or 



drooping; more so than in cernuous. 

 (Fig. 21.) 



Percurrent costa, reaching to the apex of the leaf, but not 

 beyond. 



Perianth, the inner, usually saclike structure surrounding 

 the base of the seta in Hepatics. (See Marchantia.) 

 Perichaetial. See bracts. 



FIG. 25. 



