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4,118 species in Yellowstone National Park
Plagiomnium cuspidatum
Poa compressa
Poa pattersonii
Podalonia mickeli
Pohlia drummondii
Cavostelium apophysatum
Polygonum aviculare
Polygonum ramosissimum
Potentilla nivea
Potthastia gaedii
Prochoerodes amplicineraria
Proserpinus clarkiae
Protosporangium articulatum
Psora cerebriformis
Ptilium crista-castrensis
Puccinia tardissima
Pyrgus centaureae
Cephalozia bicuspidata
Pyrola dentata
Cerastium beeringianum
Rhithrogena futilis
Rhithrogena morrisoni
Rhizocarpon lecanorinum
Rhizocarpon pusillum
Rhizomnium punctatum
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