Polymor´phous (Gr—multiform, manifold), varying much in appearance, form or structure in the same species or group; characterized by polymorphism.

Polys´tichous (Gr—many, +—row, line), arranged in many rows.

Pore (porus, a pore), in Pyrenomycetes same as ostiole; in Hymenomycetes same as tubulus or tube, as the tubules of Polypores; also the mouth of a tubulus.

Po´riform (porus, a pore; forma, form), in the form of pores.

Po´rose, Po´rous (porosus, < porus, a pore), furnished with pores or tubules; pierced with small holes.

Porphyros´pore (Gr—purple, +—seed), a group of fungi having purple spores.

Porrect´ (porrectus, pp. of porrigere, stretch out before, reach out, extend, < por, forth, + regere, stretch, direct), extended forward; stretched forth horizontally.

Poste´rior (posterior, compar. of posterus, coming after, etc.), denotes a position or under side of the pileus adjacent to the stem; the end of a lamella next the stem is the posterior end.

Premorse´ (premorsus, pp. of premordere, bite in front or at the end), having the apex irregularly truncate as if bitten or broken off.

Primor´dial (primordium, pl. primordia, origin, beginning), first formed; existing from the beginning.