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4,118 species in Yellowstone National Park
Physcia stellaris
Physconia enteroxantha
Picea pungens
Placynthiella icmalea
Placynthium nigrum
Plagiomnium cuspidatum
Poa compressa
Poa pattersonii
Podalonia mickeli
Pohlia drummondii
Polygonum aviculare
Polygonum ramosissimum
Potentilla nivea
Potthastia gaedii
Prochoerodes amplicineraria
Proserpinus clarkiae
Protosporangium articulatum
Psora cerebriformis
Ptilium crista-castrensis
Puccinia tardissima
Pyrgus centaureae
Pyrola dentata
Rhithrogena futilis
Rhithrogena morrisoni
Rhizocarpon lecanorinum
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