Perithe´cium (pl. Perithe´cia) (Gr—a lid), cup-shaped ascocarp with the margin incurved so as to form a narrow, mouthed cavity; the case or hollow shell which contains the spores.

Per´onate (peronatus, < pero, a kind of high boot), sheathed, booted; said of the stem when it has a boot-like or stocking-like covering.

Persis´tent, enduring, continuing without withering, decaying or falling off.

Per´sonate (personatus, masked, < persona, mask), masked or disguised in any way.

Per´vious (pervius, passable; < per, through; via, a way), having an open tube-like passage.

Pezi´zoid, resembling a Peziza.

Pi´leate (pileatus, capped, bonneted), having a cap or pileus.

Pile´olus (pl. Pileoli) (pileolus, dim. of pileus, a hat), secondary pileus, arising from the division of a primary pileus; a little pileus.

Pi´leus (pl. Pi´lei) (pileus, a hat), a part of the receptacle of a fungus, e. g. the cap-like heads of agarics; it may be stipitate, sessile, dimidiate, regular or irregular in form.

Pilif´erous, Pilig´erous, Pi´lose, Pi´lous (pilus, hair, + ferre, bear), covered with hair, especially with fine or soft hair.