Panaeolina foenisecii – synoniem of Panaeolus foenisecii
Panaeolus olivaceus – synoniem of Panaeolus fimicola
Paxillus rubicundulus – synoniem of Paxillus filamentosus
Peckiella lateritia – synoniem of Hypomyces lateritius
Peckiella viridis – synoniem of Hypomyces viridis
Peziza praetervisa – synoniem of Peziza subviolacea
Phaeogalera oedipus – synoniem of Pholiota oedipus
Phaeomarasmius horizontalis – synoniem of Psilocybe horizontalis
Phellinus pomaceus – synoniem of Phellinus tuberculosus
Phellinus ribis – synoniem of Phylloporia ribis
Pholiota carbonaria – synoniem of Pholiota highlandensis
Pholiota destruens – synoniem of Pholiota populnea
Pholiota graminis – synoniem of Pholiota conissans
Pholiota lutaria – synoniem of Pholiota conissans
Pholiotina aporos – synoniem of Conocybe aporos
Pholiotina arrhenii – synoniem of Conocybe arrhenii
Phylloporus rhodoxanthus – synoniem of Phylloporus pelletieri
Pisolithus tinctorius – synoniem of Pisolithus arhizus
Pleurotellus herbarum – synoniem of Crepidotus epibryus
Pluteus atricapillus – synoniem of Pluteus cervinus
Pluteus lutescens – synoniem of Pluteus romellii
Pluteus plautus – synoniem of Pluteus semibulbosus
Propolis versicolor – synoniem of Propolomyces versicolor
Psathyrella hydrophila – synoniem of Psathyrella piluliformis
Psathyrella squamosa – synoniem of Psathyrella artemisiae
Psathyrella velutina – synoniem of Lacrymaria lacrymabunda
Pseudocraterellus sinuosus – synoniem of Pseudocraterellus undulatus
Pulcherricium caeruleum – synoniem of Terana caerulea
Pustularia catinus – synoniem of Tarzetta catinus
Pustularia cupularis – synoniem of Tarzetta cupularis