96 HERRE 



spores ellipsoid to spindle-shaped, straight or slightly curved, 

 2.8-5.6 



9.75-18 



Abundant on the bark of various living trees in the foothills and 

 along the coast; rarely on old fences in the mountains. 



The var. pacifica of Tuck., distinguished by a black, Kmiting hypo- 

 thallus and more distinct septum in the spores, and the var. atlantica of 

 the same author, are both found on this coast. 



Common in Europe, on bark and dead wood, in New England, and 

 on the Pacific coast. 



4. CATILLARIA GLOBULOSA (Flk.) Th. Fr. 



Lecidea globulosa Floerke, Deutsch. Lich. 181. 1815. 

 Catillaria globulosa Th. Fr. Lich. Scand. 2: 575. 1874. 

 Biatora globulosa Tuck. Syn. N. A. Lich. II: 32. 1888. 



Thallus greenish white, thin, effuse, of minute, crowded warts or 

 granules, or these now and then scattered; KOH— ; CaC]202 — . 



Apothecia small to very small, sessile or semi-immersed in the 

 thalline warts, soon convex and sub-globose, immarginate ; very young 

 and small apothecia are fiat with a thin margin; disk dark brownish 

 black to black, opaque; epithecium pale sordid yellowish; paraphy- 

 ses conglutinated, indistinct, their tips thickened; hymenium color- 

 less, blue with I; hypothecium colorless; asci clavate; spores nar- 



3~3-5 

 rowly oblong, faintly septate, at times a Httle curved, 7 f^- 



On old fences near Los Gatos, at an altitude of 450 feet. 

 A European lichen reported in this country from the White Moun- 

 tains and from British America. 



XXI. Bacidia (DeNotaris) A. Zahlbr. 



Bacidia DeNotaris, Giorn. Bot. It. an. 2, tom. I: 189. 1846. 

 Bacidia A. Zahlbruckner, Ascohchenes, 135. 1907. 



Thallus uniform crustaceous, without cortex. Apothecia circu- 

 lar, sessile or rarely innate or elevated, the disk plane or strongly 

 convex; the proper margin colorless or dark; paraphyses simple, free 

 or coherent, their ends often thickened; hypothecium clear to dark; 



