United States Forest Service
National Lichens & Air Quality Database and Clearinghouse
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Lichen Plot Data
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Lichen Photographs
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Conditions of Photograph Use
Parmotrema arnoldii
Parmotrema chinense
Parmotrema crinitum
Peltigera britannica
Peltigera britannica
Peltigera collina
Peltigera collina
Peltigera didactyla
Peltigera leucophlebia
Peltigera malacea
Peltigera membranacea
Peltigera membranacea
Peltigera venosa
Phaeocalicium compressulum
Phaeocalicium populneum
Phaeorrhiza sareptana
Physcia aipolia
Physcia caesia
Physcia phaea
Physcia stellaris
Physconia americana
Physconia detersa
Pilophorus acicularis
Pilophorus acicularis
Pilophorus clavatus
Pilophorus nigricaulis
Placopsis gelida
Platismatia glauca
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