132 HERRE 



2. POLYCHIDIUM MUSCICOLA (Swartz) S. Gray. 



Lichen muscicola Swartz, N. Act. Ups. 4: 248. 1784. 

 Polychidium muscicola S. Gray, Nat. Arr. 1 : 402. 182 1. 

 Leptogium muscicola Fries, Sum. Veg. 122. 1846. 

 Leptogium muscicola Tuck. Syn. N. Am. Lich. I: 154. 1882. 

 Leptogium muscicola Cummings and Seymour, Decades N. Am, Lich. 

 no. 65, Franconia Mountains, N. H. 



Thallus minute, pulvinate, fruticulose, irregularly and intricately 

 branched and interwoven; branches more or less cylindrical, decum- 

 bent; apothecia medium, subterminal, appressed, brownish red; disk 

 flattish, becoming convex when the thin, entire, paler margin is 

 finally excluded; spores bilocular, colorless, cymbiform and fusiform, 



/J-; according to Tuck., ^. 



17 - 25 18 - 30 



Growing over mosses on rocks in mountains. Not found by me 

 but in the Tuck. Herb, there are specimens collected by Bolander in 

 the mountains back of Redwood City, on the road to Pescadero, and 

 also from Bear Valley, the last locaHty in Mariposa County. 



Probably generally distributed on the Pacific Coast from Central 

 CaHfomia to Bering Sea. A lichen of Europe and Northern Africa, 

 and in America recorded from New England, Cahfornia, and the 

 islands of Bering's Straits. 



PYRENOPSIDACEiE. 



Thallus crustaceous, foliaceous, or fruticose, in our species adnate 

 or fastened by rhizoids; alga Gloeocapsa. Apothecia closed or open, 

 or apparently between the two types; proper margin present or lack- 

 ing; those with dish-like apothecia have a thalline margin; paraphy- 

 ses gelatinizing or distinct, unbranched or septate; asci 8 or many 

 spored; spores colorless, simple or bilocular, ellipsoid or globose. 



Of the 16 genera recognized by Zahlbruckner, but one has as yet 

 been collected within our Umits. 



XXXI. Pyrenopsis (Nyl.) Forss. 



Pyrenopsis Nyl. Mem. Soc. Cherb. 3: 164. 1855. 



Pyrenopsis Forssell, Beitrage der GloeoHchenen . 



1885. 



