Phycolichens, lichens in which the gonidia are blue-green (Myxophyceae), [52] et passim.
Placodioid, thallus with a squamulose determinate outline, generally orbicular; [cf. effigurate], [80].
Placodiomorph, [see polarilocular].
Plectenchyma (Plectenchymatous), pseudoparenchyma of fungi and lichens, [66] et passim.
Pleurogenous, borne laterally on hyphal cells; [see spermatium], [312].
Pluri-septate, term applied to spores with several transverse septa, [321 et seq.]
Podetium, stalk-like secondary thallus of Cladoniaceae, [114], [293 et seq.]
Polarilocular, Polaribilocular, two-celled spores with thick median wall traversed by a connecting tube, [188], [340-341].
Polytomous, arising of several branches of the podetium from one level, [118].
Proper margin, the hyphal margin surrounding the apothecium, [157].