8 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



was the same as Lecidea alpicola^ Sclia?r., but that, Leightou (Lichen 

 Flora of Groat Britain, p. 328) states, has colorless spores. 



Buellia petrasa, (Fl.) Tnek. 



Saiut Paurs, Kodink. Port Clarence, Alaska. Plover Bay, Siberia. 



Apparently very variable. Tli. with potassiam hydrate and lime 

 hrown, with lime light yellow. Spores elliptical or oblong murali-locular 

 (apparently); in my specimens only 1 or 2 in an ascns 50-55 mic. long, 

 by 35 broad; opispore thick, interior light greenish brown. 



Buellia petraea, (Fl.) Tnck. var. Montagnei, (Fl.) Tuck. 



Cook's Inlet and Port Clarence, Alaska. 



Spore oblong-ollii)tical, murali-locular, 50 to 00 mic. long, by 15 to 30 

 broad, epispore usually very thick (5 mic); somewhat distinctly con- 

 stricted or transversely marked ; interior greenish yellow. 



Buellia petiaea, (Fl.) Tuck. var. Oederi, (Acb.) Kbr. 

 Locality not given. 



Buellia geographica, (L.) Br. & Rostr. 



Aliaska Peninsula. 



A widely diflused and variable species ; spores dark-brown, irregu- 

 larly 2-celled or murali-locular, 22-35 mic. long, by 13-lG mic. wide. 



Xylographa opegraphella, Nyl. 



Cook's Inlet, Alaska. 



Spores simide, colorless, oblong, obtuse or acutish, straight or very 

 slightly curved, often somewhat clearly nucleated at each end. My 

 own measurements give for the spores 11-12 mic. long by 2-4 mic. wide. 

 Mr. Willey finds them varying from 9-15 mic. long by 4-0 mic. wide. 



Xylographa parallela, (Ach.) Fr. var. pallens, Nyl. 

 Island in Cross Sound, Alaska. 

 Spores simple, elliptical, colorless, 10-15 mic. long by 5-8 wide. 



Sphaerophorus globiferus, (L ) DC. 



Saint Matthew's Island in Behring Sea; also at Port Mulgrave and 

 Little Koniushi Island of the Shumagin Group. 



Spores globular, simple, with a dark violet epispore* 8-11 mic; when 

 without epispore colorless or greenish, 5-8 mic. in diameter. 



* "Leighton describes the spores as hyaline and double-walled, and ascribes their 

 black color aud irregular granulated form to their contents, which are blackish or 

 bluish black granules, and which when they escape adhere to the exterior of the 

 mother-cell. Tulasne speaks of the epispore as black and tuberculated, while thb 

 endospore is pale but thick ; and the phenomena of germination prove the correct- 

 ness of this view." — Popular History of British Lichens, by W. Lander Lindsay, M. 

 D., p. 288. See also Leighton, Lichen Flora of Great Britain, 3d edition, jj. 48. I 

 have accepted here the view of Tulasne as that which my observation more fully 

 confirms, but at the same time, find a large quantity of the same material as that of 

 which the so-called epispore is composed, and which appears to have no relation to 

 epispore. — J. T. R. 



