-83- 



Parmelia perlata (L.) Ach. A poorly developed, sterile lichen which 

 I take to be this species is occasional on fences, roofs, and limbs of trees. 



Parhelia saxatilis (L.) Ach. Commonest of all our foliaceous lichens, 

 on all sorts of trees and often absolutely covering branches and twigs of deciduous 

 native and cultivated trees. The individual thalli are small and sterile as a 

 rule, but not rare in fruit on Lummi Island. 



Parmelia fuliginosa (E. Fr.) Nyl. Common on various barks but small 

 and poorly developed. 



Parmelia pubescens (L.) Wainio. Common and fertile on rocks at the 

 snow line and above on Mt. Baker. 



Parmelia physodes (L.) Ach. Common on bark and old fences. 



Parmelia enteromorpha Ach. On dead and living trees of all sorts through- 

 out the forested regions and on old fences. Some of our material has a very 

 close resemblance to Parmelia lugubris. 



Cetraria glauca (L.) Ach. On mossy logs and trees throughout. 



Cetraria lacunosa stenophylla Tuck. Common in the forests of Mt. 

 Baker. 



Cetraria Tuckermani Herre. Abundant on trees in the Mt. Baker forest. 

 Cetraria chlorophylla (Humb.) Wainio. On twigs and old fences in 

 the lowlands. 



Cetraria islandica (L ) Ach. On Mt. Baker from a little below the snow 

 line upward. 



Nephromopsis ciliaris (Ach.) Hue. On various conifers in the moun- 

 tains and on birch bark in the lowlands. 



Nephromopsis platyphylla (Tuck.) Herre. Abundant on bark of Abies 

 sp., on Mt. Baker at 6000 feet. 



EvERNiA prunastri (L.) Ach. Common on trees and fences in the low- 

 lands. 



Letharia vulpina (L.) Wainio. Common enough on bark of Douglas 

 spruce, but small, poorly developed, and sterile. Thus far I have seen nothing 

 corresponding to the luxuriant growth so conspicuous in the high Sierras of Cali- 

 fornia. 



Alectoria jubata implexa (Hoffm.) Ach. On various trees, living and 

 dead, at 6000 feet on Mt. Baker; well developed but sterile. Also at all levels 

 below down to less than 100 feet, but very small. 



Alectoria sarmentosa i^ch. On various trees on Mt. Baker, intertangled 

 with the preceding species. 



Alectoria oregana Nyl. A sterile lichen occurs on Mt. Baker on the 

 bark of Abies which I place here; it does not quite accord with the luxuriant 

 specimens collected by me in California. 



Ramalina inflata Hook. & Tayl. Not common; on trunks of trees in 

 the lowlands and lower mountain slopes. 



Ramalina reticulata (Noehd.) Krempelh. Abundant on Lummi Island. 



Usnea FLORIDA (L.) Weber. Common throughout but poorly developed; 

 on twigs, tree trunks, and fences. 



