Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Basidiomata: growing on the isidia of the host, not inducing gall formation, convex, subglobose, waxy-gelatinous, orange brown, mainly 0.12-0.22 mm in diam., when old, strongly tuberculate and darker, up to 0.4 µm in diam. hyphae: context hyphae: thin-walled, 2-2.5 µm in diam.; clamps: not observed haustorial branches: present, tremelloid; mother cell: ellipsoid to subspherical, 2-3 µm in diam.; haustorial filament: 3-5 µm long hymenium: containing numerous probasidia imbedded in a dense gel, as well as numerous swollen hyphidia; probasidial initials: subspherical to ellipsoid, proliferations occurring through the basal clamp; hyphidia: swollen, thin-walled, elongate, with numerous septa, when old with several ramifications, 4-7 µm in diam., up to at least 60 µm long; individual cells: 5-7.5 µm long basidia: when mature, 2-4-celled, with longitudinal or slightly oblique septa, 10-14 x 5.5-10 µm epibasidia: subcylindrical, about 10-14 µm long and 1-1.5 µm in diam. basidiospores: subspherical, with a distinct apiculus, 6-8 x 5-6.5 µm in diam. Anamorph: unknown. Hosts: isidia of Leptogium species, not gall-forming World distribution: South America and Mexico, obviously rare Sonoran distribution: Baja California Sur, known from a single locality. Notes: Tremella leptogii is rare species distinguished from other Tremella species studied here by its conspicuous, thick hyphidia occurring in the hymenium, its smaller basidia, its much shorter epibasidia and its smaller basidiomata.