Howe: American Species of Alectoria 



149 



I have excluded from this genus Oropogon Loxensis (Fee) Th. 

 Fr. as have recent authors on the ground of its distinctive spore 

 differences. This monospecific genus will be treated in a later 

 paper. 



In concluding this study I have many persons to thank, not only 

 for the loan of material, but for much assistance in the examina- 

 tion of literature. For the most part they have been those per- 

 sons who have helped in the past in the preparation of my papers 

 on the Usneas and Evemias, and without whose ready help the 

 completion of these studies would have been impossible. 



Thoreau Museum Natural History, 

 Concord, Massachusetts. 



Explanation of Plate 41 



1. Cetraria calif ornica Tuck. Specimen in the U. S. National Herbarium. 

 X §. 



2. Cetraria calif ornica sepincola R. H. Howe, Jr., ex Tuck. Specimen in 

 the U. S. National Herbarium. X §. 



3. Alectoria osteina Nyl. Specimen Taylor Herbarium, Boston Society 

 Natural History, from Mexico. X §. 



4. Alectoria bicolor (Ehrh.) Nyl. Specimen No. 1861, Author's herbarium 

 from Yukon. X §. 



5. Cetraria calif ornica Tuck., reduced condition. Specimen in the U. S. 

 National Herbarium. X §. 



Explanation of Plate 42 



1. Alectoria chalybeiformis (L.) Gray. Specimen in the herbarium of the 

 Boston Society Natural History. Slightly reduced. 



2. Alectoria diver gens (Ach.) Nyl. Specimen in the Taylor Herbarium, 

 Boston Society Natural History. X 3. 



3. Alectoria Fremontii Tuck. Specimen (cotype) in the Taylor Herbarium, 

 Boston Society Natural History. X i. 



4. Alectoria jubata implexa (Hoffm.) Ach. Specimen in the herbarium of 

 Dr. L. W. Riddle, Wellesley, Mass. X h 



Explanation of Plate 43 



1. Alectoria sarmentosa (Ach.). Specimen in the herbarium of Wellesley 

 College. X h 



2. Alectoria virens Tayl. Type specimen in the Taylor Herbarium, Boston 

 Society Natural History. X 



3. Alectoria oregana Nyl. ex Tuck. Specimen in the Sprague Herbarium, 

 Boston Society Natural History. X i- 



4. 5. Alectoria oregana Nyl. ex Tuck. Specimens (cotypes) in the Sprague 

 Herbarium. X 5. 



