Poplar Sunburst Lichen

The lichen has a yellowish-orange thallus comprising small, overlapping lobes (measuring 0.3–0.9 mm wide) arranged in a loosely attached rosette. The thallus undersurface is white, and attaches to the bark substrate by relatively long rhizines. There are neither isidia nor soredia on the thallus surface. Apothecia, usually numerous in the center of the thallus, have dark orange discs and are 0.6–3 mm in diameter. Ascospores are ellipsoid in shape with a single septum, and have typical dimensions of 15.5–18 by 7.5–9.5 μm. Gallowayella hasseana mostly grows on bark (especially poplar bark), although it has occasionally been recorded on rock or on wood. It prefers open or partially shaded areas.

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