Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Mycelium: visible as small dark brown to black patches, normally conspicuous around the ascomata, forming there a subiculum, at the edge the hyphae sometimes radiating; subicular hyphae: brown, 5-7 µm thick Ascomata: black, subspherical to ovate, 400-700 µm; ascomatal wall: 20-35 µm thick, with isodiametric to slightly flattened wall cells hymenium: composed of numerous paraphyses and asci, paraphyses: with delicate walls, 2-4 µm thick periphyses: forming a crown, with delicate walls, dissolving with age asci: cylindrical, 80-95 x 9-12 µm, 8-spored ascospores: dark brown, mostly simple but often several 1-septate spores present, +round to broadly elliptical or often somewhat more ellipsoid when mature, in over-aged ascomata however the majority of spores 1-2-septate, with straight asymmetric septa, rarely with germ pores, 9-14(-16) x 8-10 µm. Hosts: on the thalli of Pertusaria wulfenioides, and Pertusaria sp. in the Sonoran region and elsewhere on Ochrolechia tartarea, Pertusaria hemisphaerica; slightly parasitic World distribution: known only from the Northern Hemisphere, widely distributed in Europe, Africa (Canary Islands), and North America (U.S.A. and Mexico) Sonoran distribution: so far known from two upland localities in Arizona and Chihuahua. Notes: Roselliniopsis tartaricola inhabits predominantly perithecia, and the shape of the perithecia varies consider-species of Ochrolechia and Pertusaria on trees. The con-ably with the inhabited host. Therefore, a thorough investispicuousness of the subiculum, the size of the groups of gation may reveal further species.