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Naetrocymbe punctiformis (Pers.) R. C. Harris
Family: Naetrocymbaceae
[Verrucaria punctiformis Pers.,  more]
Naetrocymbe punctiformis image
Thallus: absent or continuous, immersed in the substrate upper surface: gray, smooth; photobiont: absent Perithecia: hemispherical, black, superficial on the thallus or bark, 0.15-0.4 mm diam ascomatal wall: black, absent below the hamathecium hamathecium: unbranched pseudoparaphyses, not anastomosing; filaments: c. 2 µm wide, cells often swollen (moniliform), not inspersed with oil droplets, but becoming slimy or oily asci: pyriform, c. 45-55 x 15-25 µm, with 8, irregularly arranged ascospores ascospores: hyaline, clavate, 1-septate with a supramedian euseptum, 18-22 x 5-6 µm; walls: not ornamented, with a 1-2 µm thick gelatinous sheath Spot tests: all negative, UV negative Secondary metabolites: none detected. Substrate and ecology: on bark of various woody plants, including Acer, Jatropha, Quercus, Punica and Rhus World distribution: northern temperate or possibly cosmopolitan Sonoran distribution: one of the most common corticolous pyrenocarps in the region, collected in California (including the Channel Islands), Arizona, Baja California, Baja California Sur and Sinaloa.