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Peltula sonorensis Budel & T. Nash
Family: Peltulaceae
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Thallus: peltate, scattered, up to 9 mm diam., margin: sometimes undulate, downcurved, entire upper surface: olive to yellowish green, smooth, shiny, not sorediate upper cortex: poorly developed, 18-20 µm thick, with a pale yellow epinecral layer (9-16 µm thick) medulla: loosely interwoven hyphae (2-2.5 µm thick, short celled), below with numerous air spaces; algal layer: 100-225 µm thick lower cortex: 18-30 µm thick, composed of anticlinally arranged, short-celled hyphae (3-5 µm wide) in 4-5 rows lower surface: paler than the upper surface, attached by a central umbilicus Apothecia: numerous, completely immersed; disc: yellow-brown, punctiform when young, later up to 0.8 mm wide; epihymenium: yellow-brown; hymenium: I+ blue, 160-240 µm high asci: clavate to obclavate; wall: I+ blue, >100-spored ascospores: bacilliform, 4-8.5 x 2-4 µm Pycnidia: immersed, spherical, chambered conidia: fusiform, 3-4 x 1 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on acidic rock in deserts and other open, arid habitats World distribution: only known from NW Mexico Sonoran distribution: desert and thorn forest areas of Sonora, Sinaloa, Baja California and Baja California Sur.