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Peltigera aphthosa (L.) Hoffm. On earth, stumps, and rotting logs; 

 common at all altitudes up to 8000 feet. 



Peltigera venosa (L.) Hoffm. Not rare on mossy earth at lower ele- 

 vations. 



Peltigera polydactyla (Neck.) Hoffm. On the slopes of Mt. Baker. 

 Peltigera canina (L.) Hoffm. Common everywhere on earth, logs, and 

 stumps. 



Peltigera canina membranacea (Ach.) Nyl. Abundant and finely devel- 

 oped in the lowlands and lower slopes of the mountains. 



Peltigera canina spuria (Ach.) Tuck. A few specimens obtained from 

 Mt. Baker. 



Pertusaria amara (Ach.) Nyl. On trunks of trees in the lowlands. 

 Pertusaria multipuncta (Turn.) Nyl. On trunks of birch. 

 Pertusaria pertusa (L.) Nyl. On various barks in the lowlands. 

 Pertusaria leioplaca (Ach.) Schaer. On bark of both species of maple, 

 in the lowlands. 



Pertusaria pustulata (Ach.) Nyl. (?) The apothecia of this lichen yield 

 me no spores, but it is nearest this species. 



Lecanora gelida (L.) Ach. Abundant in the mountains at 2000 feet 

 and upward wherever there are rock exposures; occasional in the lowlands on 

 erratic glacial boulders. 



Lecanora pacifica Tuck. Abundant on bark of various deciduous trees 

 in the lowlands. 



Lecanora subfusca (L.) Ach. Common in same localities as above; sev- 

 eral varieties occur. 



Lecanora coilocarpa (Ach.) Nyl. On Acer macrophyllum, in lowlands. 



Lecanora Hageni Ach. On bark in lowlands and very finely developed 

 on rocks, Mt. Sumas, at 2500 feet. 



Lecanora varia (Ehrh.) Ach. On bark of various deciduous trees, in 

 lowlands. 



Lecanora polytropa Nyl. What I take to be this occurs on the thallus 

 of other lichens; locality Mt. Baker, above 6000 feet. 



Lecanora frustulosa (Dicks.) Ach. Rare; Mt. Baker, 



Lecanora alpina Sommerf. Rare; small patches among Rhizocarpon 

 geographicum; Mt. Baker, above snow line. 



Lecanora gibbosa (Ach.) Nyl. Specimens scanty and very dark, resem- 

 bling sea-coast aberrant forms from the Santa Cruz Peninsula; on Sumas Mt., 

 at 2500 feet. 



IcMADOPHiLA ericetorum (L.) A. Zahlbr. On old logs and stumps, in 

 the lowlands. 



OcHROLECHiA TARTAREA (L.) Mass. Common throughout the forested 

 regions. 



Lecania dimera (Nyl.) Oliv. Occasional on smooth barks in the lowlands. 

 Candelariella cerinella (Flk.) A. Zahlbr. On rocks with other lichens; 

 Mt. Baker, 6000 feet altitude; also on Sumas Mt. at 2500 feet. 



