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 Thallus: crustose, areolate; areoles: angular, sides vertical, closely compacted, 0.1-0.3 mm broad; surface: dull greenish-brown varying to orange-brown, in the mass the color is nearly greenish yellow or olive-gray; usually only slightly convex; Perithecia: with base partly immersed in the areoles; involucrellum: black, very prominently projecting above the areoles (not within as in S. areolata); exciple: black; hymenial gelatin: I+ blue; asci: broadly clavate, 2-spored; ascospores: ellipsoid to narrowly ellipsoid, greenish initially, soon becoming dark brown, muriform 7-8 (-12)-septate transversely, 2-3 septate longitudinally, 26-60 x 10-26 µm; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on calcareous rocks at altitudes ranging from 700-3600 m; World distribution: North America, from California to Minnesota; Sonoran distribution: Arizona to Sonora, 100 to 2300 m.; Notes: In Hasse's Lich. Exs. 212 (W, ASU), it is reported as Endocarpon monicae Zahlbr. In comparison with S. areolata, S. monicae is duller and the areoles are not as convex. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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