382 herre: lichen flora 



ARTHOPYRENIA CERASI (Schrad.) Koerber. Verrucaria cerasi Schrader 

 Cryptog. Exsicc. 1797. Arthopyrenia cerasi Koerber, Syst. Lich. 369. 1855. 

 Thallus very thin, pale yellowish to brown, forming small, determinate, distinct, 

 more or less shining spots which are irregular or more or less rounded in outline, 

 their diameter 8 to 25 mm. Apothecia numerous, often crowded, minute, 0.3 

 mm. in diameter, convex, shiny black; perithecium black, dimidiate; paraphyses 

 absent; asci tawny with I; spores quadrilocular, 5.75 to 6/x broad, by 20.5 to 27^ 

 long. Rare with us; collected on smooth barked poplars at Stanford University. 

 A fairly common European lichen. 



ARTHOPYRENIA SPHAEROIDES (Wallr.) A. Zahlbr. Arthopyrenia sphaer- 

 oides A. Zahlbr. in Engler and Prantl, Natur. Pflanzenfam. I Teil, Abteil I*, 65. 

 1903. Thallus thin, uniform, effuse, whitish to greenish olive; darkened by 

 KOH; CaCl202- Apothecia numerous, conspicuous, semi-immersed to sessile, 

 hemispherical to sub-globose, black; ostiolum dot-like or more often not visible; 

 perithecium black, dimidiate; paraphyses hair-like, twining; asci tubular, 8.7/x 

 by 68 to 88/x long; spores 3 to 5.8/j. wide by 9 to 13/x long; thecium — reddish brown 

 with I. On Quercus agrifolia at Laguna Creek, elevation about 50 feet. Referred 

 here with considerable doubt, rather than to call it new. 



ARTHOTHELIUM ANASTOMOSANS (Ach.) Arn. Arthonia astroidea anastom- 

 osans Ach. Lich. Univ. 146. 1810. Arthothelium anastomosans Arnold, Verh. K. K. 

 Zool. Bot. Gesell. Wien, 22 : 304. 1872. Thallus very thin, uniform, gray, forming 

 more or less orbiculate, definite, but small and inconspicuous patches; no chemical 

 reactions evident. Apothecia numerous, minute to small, 0.4 to 0.1 mm. across, 

 black, more or less elevated; of many different shapes, rounded, elongate, and 

 difform, simple, straight, or curved, stellate, and branched; thecium blue with I; 

 asci pyriform or ventricose; spores 6 to 8 in the asci, colorless, with 6 transverse 

 rows of cells and 2 longitudinal rows, 6 to 8.8yu broad by 14.6 to 19m long. On twigs 

 of Cupressus macrocarpa and Pinus radiata at Stanford University. By the spores 

 this is anastomosans, but it does not agree very well in other respects. Appar- 

 ently rare, but perhaps really passed over as Arthonia radiata; a microscopic exam- 

 ination is the only sure test. Recorded also by Dr. Hasse from Catalina Island. 

 A European lichen of widespread distribution. 



LECIDEA ATROBRUNNEA (Ram.) Schaerer. Lichen atro-brunneus Ramond 

 in DC. Fl. Fr. 2: 367. 1803. Lecidea atro-brunnea Schaerer, Spicilegia, 134. 

 1828. Tuckerman, Synopsis, 2 : 74. 1888. Thallus of thick areoles or squam- 

 ules which may be thinly scattered, closely set, or crowded, upon a conspicuous 

 black limiting hypothallus; areoles from small and flat soon swollen and convex, 

 with a thin black margin or abnormally with pale or white edges; circular or irreg- 

 ular in shape, finally with wavy and sculptured surface, the marginal areoles some- 

 times elongate and lobate; color brown, varying from pale and yellowish to copper, 

 chestnut, and blackish brown, smooth and -shiny to dull; medulla blue or violet 

 with I. Apothecia small to medium, rarely large, 0.5 to 1.8 mm. in diameter; 

 closely adnate, flat or slightly hollowed, black tho sometimes pruinose, with an 

 entire, thick, elevated, concolorous margin; finally more or less flexuous with 

 wavy or crenate margin, and the disk more or less swollen, and thru crowding 

 or fusion forming irregular clusters, when the apothecia seem to be very large; 

 hypothecium pule to brownish; epithecium thick, greenish black; paraphyses 

 Blender, straight, their slightly enlarged tips and upper portion greenish; thecium 



