Appearance
The stromata of "A. annulatum" are semi-globose to cushion-like and are black in color. They are covered in ostioles surrounded by a flat disc area. A hand lens may be needed in order to see this. This species commonly grows on oak and when crushed and mixed with potassium hydroxide will produce an olive green pigment. Microscopically, "ascospores brown to dark brown, ellipsoid-inequilateral, 7.5–12 × 3.5–5 μm, with straight germ slit spore-length".References:
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