OF WESTERN PENNSYLVANIA 359 



Homomallous, (leaves) bent or curved to one side, all in the 



same direction. 

 Hyaline, transparent and colorless like water. 

 Hygroscopic, altering form or position with changes in moisture. 

 Imbricated, overlapped like the shingles on a roof. 

 Immersed, (capsule) concealed within the leaves of the peri 



chaetium. 

 Incrassate, thickened, or thick-walled (cells). 

 Indchiscent, not splitting open. 

 Inflorescence, the clusters of reproductive organs, usually with 



enclosing bracts. 

 I nnovation, a young offshoot from the stem. 

 Insertion, the point of attachment of the leaf to the stem or 



branch. 

 Involucre, a whorl of leaves or bracts around the flower. 

 liliaceous, worm-like or catkin-like. 

 Laciniate, deeply slashed or cut into narrow lobes. 

 Lamellae, thin plates, particularly the flat plates on the dorsal 



surface of many peristome-teeth ; also on ventral surface 



of many leaves. 

 Lamina, the leaf-blade. 

 Lanceolate, lance-shaped. 



Lid, the covering of the mouth of the capsule, the operculum. 

 Ligulate, strap-shaped. 



Linear, long and narrow with parallel sides. 

 Lingulate, tongue-shaped. 

 Lumen, the cavity of a cell. 



Mamillate, tipped with a nipple-shaped projection. 

 Margin, (of a leaf) a bordering band of peculiar shape or color. 

 Mitrifonn, mitre-shaped, or like a peaked cap, symmetric. 

 Monoicous, with the antheridia and archegonia on the same plant. 

 Mncronate, with the costa percurrent as a short small abrupt tip,^ 



tipped with a mucro. 

 Muricate, with the surface roughened with short, hard points. 

 Muticous, not pointed. 

 Neck, the collum. 



Nodose, (cilia) with knots or swollen articulations. 

 Ob-, a prefix often used to convey the sense of inversion. 

 Obconic, inversely conic. 

 Obcordate, inversely cordate. 



Obovate, inversely ovate, narrowed towards the base. 

 Obsolete, scarcely apparent. 



Oprculum, the lid covering the mouth of the capsule. 

 Ovate, more or less egg-shaped, with the broader end downward. 

 Ovoid, more usually applied to a solid with an egg-like outline. 

 Panduriform, fiddle-shaped. 

 Papillae, minute nipple-shaped protuberances. 



