42 HERRE 



differing in the thinner thallus, the much larger and somewhat dif- 

 ferently shaped spores, and the chemical reaction. A specimen of 

 Verrucaria maura from Dr. Farlow, collected at Campobello, New 



Brunswick, yields me oblong spores, measuring -~ 7 a, while the 



I2i — 16 



reaction with I is vinous red. 

 (melas, ixiXac, black.) 



6. VERRUCARIA CALCISEDA FUSCA-SPORA Herre, n. subsp. 



Verrucaria calciseda DC. Fl. Fr. 2: 317. 1805. 



Verrucaria calciseda Leighton, Lich. Fl. Grt. Britain, ed. 3, 458. 1879. 



Thallus effuse, endolithic, very thin and powdery or obsolete, form- 

 ing white spots on the rock. 



Apothecia numerous, minute, black, immersed in tiny pits in the 

 rock, becoming slightly protuberant; ostiolum depressed, circular, 

 pore-like, or often irregularly fissured; perithecium broad, dimidiate, 

 black; gelatinous thecium bluish or blue with I; asci clavate; spores 

 ovoid or elliptical, from colorless becoming dusky and finally dark 



brown, ^~ ^ «. 



i7i - 28'^ 



Abundant on limestone near the summit of Black Mountain, alti- 

 tude 2700 feet, mixed with Rinodina hischoffi, immersa, from which 

 it is with difficulty externally distinguishable. The internal structure 

 not satisfactorily made out owing to the difficulty of extracting the 

 apothecia from their holes without breaking them. 



Differs from the type in having dark spores. Leighton says (Brit. 

 Angiocarpous Lichens, 60, 1851, pi. 25, f. 4) that the spores of V. 

 rupestris are pale yellow, but elsewhere he and other authors call the 

 spores of all this group colorless. 



(fusca, dark; spora, oTzdpoc, seed.) 



7. VERRUCARIA STANFORDI Herre, new species. 



Thallus of thick, somewhat convex areoles, reaching a thickness of 

 2 mm., either separate or arranged in small groups or finally compacted 

 into a deeply fissured, continuous, chinky crust; the surface very min- 



