upper side grayish olive to dark olive, sometimes glaucous, epruinose, lobate, close to the substratum, the center more or less areolate, the margins distinctly radiate-lobate, the lobes very convex to almost cylindrical; corticate above and below. Apothecia
to 2 mm broad, adnate with entire margin concolorous with thallus; disk
brown or black-brown, sometimes pruinose; hypothecium hyaline, 1+ pale blue; epihymenium
pale or brown, HC1-; hymenium 70-75 fim, 1+ brown; paraphyses
coherent, thick, over 2.5 µm, upper part moniliform, 4-6 µm with the uppermost cell globular; spores
8, ellipsoid, 8-14 x 5-9 µm. Conidia
short, cylindrical, 5-6 µm.
Reactions: medulla K+ red, P+ orange, I-.
Contents: norstictic acid, placodin, sometimes only in trace amounts (Hermann etal. 1973).
This species grows on acid rocks. It is circumpolar arctic, boreal and temperate, ranging south in North America to Arizona.
Although recent European lichenologists place this species and A. alphoplaca in this genus, there is room for question as to whether this is the best disposition, as these have short, cylindrical conidia and this species does not have the characteristic "aspicilia-green” HCL reaction. A. meianaspis differs from A. alphoplaca in its contents of placodin as well as in possessing rather trace amounts of norstictic acid, so that it often yields negative reactions.