Description ⁶

 Thallus: foliose, 4-12 cm in diam., adnate to tightly adnate, subdichotomously lobate; lobes: sublinear to subirregular, somewhat elongate, initially separate, becoming slightly imbricate, concave or plane, 1-2 mm wide, margin: entire; apices: subtruncate, plane; upper surface: whitish gray, smooth, shiny, white maculate; isidia, soredia, pustulae and dactyls all absent; medulla: white with continuous algal layer; lower surface: black, rhizines: dense, black, dichotomous; Apothecia: abundant, laminal, substipitate, 2-20 mm in diam.; disc: brown; margin: crenulate and white maculate; asci: clavate, 8-spored; ascospores: ellipsoid, 10-13 x 6-7 µm; Pycnidia: marginal or submarginal, immersed; conidia: not seen; Spot tests: upper cortex K+ yellow, C-, KC-, P+ yellow, UV-; medulla K-, C + red, KC + red, P-; Secondary metabolites: upper cortex with atranorin and chloroatranorin; medulla with evernic and lecanoric acids (both major).; Substrate and ecology: on hardwood bark, particularly smooth barked Quercus species, in montane and upper montane forests; World distribution: neotropics and extending into adjacent temperate areas; Sonoran distribution: SE and E Arizona and S along the Sierra Madre Occidental in Sonora, Chihuahua and Sinaloa and the mountains of southern Baja California Sur.; Notes: Particularly in SE Arizona and the northern part of the Sierra Madre Occidental this species is the most common Hypotrachyna at mid-elevations. 

Sources and Credits

1. (c) Felix Schumm, some rights reserved (CC BY-NC-SA), http://www.tropicallichens.net/photopath/hypotrachyna-pulvinata-madeira.jpg
2. (c) National Museum of Natural History Collections, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10614821
3. (c) Ingrid P. Lin, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10614822
4. (c) National Museum of Natural History Collections, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10614824
5. (c) National Museum of Natural History Collections, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10614825
6. (c) Lichen Unlimited: Arizona State University, Tempe., some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/10547631

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Global Biodiversity Information Facility (GBIF)
• Mushroom Observer
• NatureServe Explorer 2.0
• SEINet Symbiota portals
• USDA PLANTS database
• Ways of Enlichenment

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