14 DISCOVERY REPORTS 



patches, o-2 0-3 mm. diam., ± hemispherical, black, matt (shining only where rubbed), with minutely 

 scabrid surface like the thallus ; solitary or two to three crowded together and then often concrescent. 

 Ostiole indistinct, not papillate or impressed. Excipulum brown to dark brown in section, entire. 

 Paraphyses dissolved, indicated by faint striae in the mucilage. Asci cylindric-clavate, 30-40 x 8-1 2 /i, 

 thin-walled. Spores ellipsoid, 8 in ascus, 8-1 1 x 4-5-5-5 fi. With iodine, hymenial mucilage rose-pink, 

 asci and spores yellowed. 



m 



Fig. 3. Perithecial structure in Antarctic Pyrenocarp lichens. (Somewhat diagrammatic.) 



a, Verrucaria Racovitzae. g, Verrucaria psychrophila. k, Staurothele gelida (with well 



b, Verrucaria ceuthocarpa. h, Verrucaria microspora (f. frisiaca). developed thallus). 



c, Verrucaria mucosa. i, Verrucaria elaeoplaca. /, Verrucaria dispartita. 



d, Verrucaria tesselatula. j, Staurothele gelida (with poorly m, Mastodia tesselata. 



e, Verrucaria serpuloides. developed thallus). w, Dermatocarpon lachneum. 



f, Verrucaria famelica. 0, Dermatocarpon intestiniforme. 



p, Microglaena antarctica. 



This species comes very near V. microspora {i. frisiaca), differing only in the minutely scabrid, often 

 somewhat cracked thallus, usually slightly roughened perithecia and the somewhat darker excipular 

 wall. Its habitat ecology, however, is different, its occurrence being in the spray zone and not in the 

 intertidal belt, as is the case with V. microspora. No. 2564 pr. p. was associated with Caloplaca cirro- 

 chrooides (Vain.) Zahlbr., in the upper part of the spray zone. In our specimens the thallus forms 

 scattered spots or effuse, ± continuous patches of small extent, it is sooty or olivaceous-blackish, about 

 o-i mm. thick, continuous or with small sporadic disconnected cracks or (in no. 2564 /)r. p., which grew 



