Appearance
Thallus foliose, appressed to the substratum, 3-7 cm broad. Lobes sublinear to irregular, 1-3 mm wide, apices rounded, margins entire, ciliate. Upper surface whitish to pale greenish, wrinkled, not pustulate, not sordiate or isidiate, slightly maculate. Medulla pale yellowish. Lowersurface black, brown narrow marginal zone, rhizinate. Rhizines black, simple. Apothecia numerous or sparse, sessile to substipitate, 1-7 mm diameter, disk brown, concave to flat, epithecium brown, 10-12 µm thick, hymenium 40-60 µm high. Asci clavate 8 spored, 25-50 × 15-25 µm.
Spores simple, colourless, round to ellipsoid, 12-14 × 6-10 µm. Pycnidia common, black. Conidia rod shaped, 6 ×1 µm.
Chemistry: Cortex K+ (yellow), C−, KC−, P−; medulla K+ (yellow to red) C−, KC+ (yellow), P+ (yellow to red).
TLC: atranorin, galbinic acid, zeorin and salazinic acid.
Naming
Myelochroa galbina (Ach.) Elix & HaleParmelia galbina Ach.
Parmelia subquercifolia Hue
Parmelia sulphorosa (Tuck.) Fink
Parmelina galbina (Ach.) Hale
Distribution
Eastern North America, Alaska, Arizona, Japan, Korea, Australia
Habitat
On the bark of trees.References:
Some text fragments are auto parsed from Wikipedia.
http://www.mycobank.org/name/Myelochroa%20galbina&Lang=Enghttp://lichenportal.org/portal/taxa/index.php?taxon=54503
https://www.waysofenlichenment.net/lichens/Myelochroa%20galbina
A Taxonomic Study of the Genus Myelochroa in South Korea. Udeni Jayalal, Santosh Joshi, Soon-Ok Oh, Young Jin Koh, and Jae-Seoun Hur. Mycobiology 40(4) : 217-224 (2012). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3538967/pdf/mb-40-217.pdf
Wetmore, Clifford M.. (2005). KEYS TO THE LICHENS OF MINNESOTA. Retrieved from the University of Minnesota Digital Conservancy, http://hdl.handle.net/11299/156243.
