Naetrocymbe rhyponta (Ach.) R.C. Harris  
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Family: Naetrocymbaceae
[Arthopyrenia rhyponta (Ach.) A. Massal., moreArthopyrenia rhyponta f. rhyponta (Ach.) A. Massal., Leiophloea rhyponta (Ach.) Trevis., Metasphaeria rhyponta (Ach.) Vain., Pharcidia rhyponta (Ach.) H. Magn., Pyrenula rhyponta (Ach.) Trevis., Verrucaria rhyponta Ach., Verrucaria rhyponta var. rhyponta Ach., Verrucaria rhyponta var. rhypontella Nyl.]
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  • Greater Sonoran Desert
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Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: consisting of a filamentous layer on the substrate (a subiculum) upper surface: black; photobiont: absent Perithecia: hemispherical, black, immersed in the subiculum, 0.15-0.3 mm diam. ascomatal wall: black, absent below the hamathecium hamathecium: unbranched pseudoparaphyses, not anastomosing; filaments: up to c. 3 µm wide below, cells often swollen (moniliform), not inspersed with oil droplets asci: pyriform, c. 50-60 x 22-27 µm, with 8, irregularly arranged ascospores ascospores: hyaline but becoming brown when old,, clavate, 3-septate (starting with a supramedian euseptum), 20-23 x 6-9 µm, often breaking into part spores; walls: not ornamented, with a 2-3 µm wide gelatinous sheath Spot tests: all negative, UV negative Secondary metabolites: none detected. Substrate and ecology: on bark of Populus tremuloides World distribution: northern temperate or nearly cosmopolitan Sonoran distribution: only collected once in Arizona.
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