Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: subfruticose to subfoliose, hollow, approximately globular also in central parts lobe surface: creamy white to ivory white, soredia: coarse in maculiform soralia, becoming confluent in the central parts of thallus medulla: white with lowermost parts brown Ascomata: absent or sparse, lirelliform with branched lirellae; hymenium: 60 µm high; paraphysoids: reticulately and richly branched, conglutinated, hyaline, c. 1 µm in diam. asci: clavate, c. 75 x 13 µm, 8-spored ascospores: fusiform, 3-4 septate, hyaline, 16-17 x 4-5 µm Spot tests: cortex K-, C+ red, KC+ red, P-; medulla K-, C+ red, KC+ red, P- Secondary metabolites: erythrin and lecanoric acid (major), montagnetol and orsellinic acid (minor) and three other minor unknowns that are probably hydrolysis or methanolysis products. Substrate and ecology: on vertical rocks and cliffs near the ocean; individuals occasionally growing in masses covering several square meters but near the ocean preferring sheltered crevices and often beneath overhangs World and Sonoran distribution: the Channel Islands of southern California south to central Baja California. Notes: Hubbsia parishii is characterized by its hollow thallus lobes and usual presence of soredia.