52 HERRE 



5. ARTHOPYRENIA BIFORMIS (Borr.) Mull. Arg. 



Verrucirw biformis Borrer, Eng. Bot. Suppl. 2617, /. r. 1829. 

 Arthopyrenia biformis Mull. Arg. 



Thallus effuse, thin, uniform or nearly so, white to dark gray in 

 color; KOH yellow brown. 



Apothecia black, numerous, of medium size, hemispherical or 

 sub-globose, the base immersed, with a minute pore at the apex; peri- 

 thecium entire, thick, black; paraphyses abundant, distinct, long and 

 thread-like, branched and entangled; asci tubular, mostly sterile with 



granular contents, yellowish with I; a fertile ascus measured /*; 



62 



spores bilocular, pointed-ellipsoid, * ^ 



18 - 24 



On the twigs of an oak in the hills west of Los Gatos, altitude about 

 1500 feet. Much resembling Arthopyrenia gemmata, but differs in 

 the entire perithecium. Referred here with doubt, the apothecia and 

 spores being larger than in European specimens in my herbarium. 

 The reaction with I is also different from that given by Leighton. A. 

 iformis is found pret y generally over Europe and North America. 



6. ARTHOPYRENIA CONFORMIS (NyL). 



Verruca ia conformis Ny lander, Flora, 257. 1864; France. 

 Verrucaria conformis Leighton, Lich.Fl. Grt. Brit. ed. 3. 463. 1879. 



Thalus effuse, thin and uniform, finally chinky abo ,t the apothecia; 

 silvery gray in color; brown with KOH ; CaCl 2 O 2 _ . 



Apothecia very numerous, small to minute, hemispherical, semi- 

 immersed, black; perithecium dimidiate but extending so far basally 

 as to be nearly entire; paraphyses long, very slender and hair-like; 

 asci long, tubular; I-; spores usually in a single row, slender ellipsoid, 

 bilocular, constricted at the middle; each cell very strongly constricted, 

 so that the spores appear 4-locular, as if made up of four balls, the end 

 ones being much smaller than the others; from falsely 2 or 3 -septate, 



3- ^i 

 sometimes distinctly 3 -septate, - '- /* 



8 J 16 



On the bark of Pseudotsuga taxifolia, in the mountains. Recorded 

 from France and the British Isles. 



