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Aspicilia subplicigera (H. Magn.) Oksner
Family: Megasporaceae
Aspicilia subplicigera image
Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus pale or dark ashy, radiate, very thin to the periphery with areolae radiately oriented over the thinner portion; the center more thickly areolate-lobate. the areolae 0.2-0.3 mm broad and 2-3 mm long; cortex paraplectenchymatous and the cells not oriented in vertical rows. Apothecia centrally located, single, immersed; margin thick; thalloid margin I-, its cells not anticlinal (oriented vertically to the surface); hypothecium cloudy, 1+ faintly blue; epihymenium brown; hymenium 85 µm, 1+ yellowish brown; paraphyses separating in KOH, 1.5 µm, tips to 3 µm, moniliform; spores 8, ellipsoid, 12-17 x 8-9 µm.

Reactions: K-, C-. P-, I-.

This species grows on acid rocks. It is known from Siberia. Novaya Zemlya. and the Northwest Territories.