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Ochrolechia africana
Crustose lichen; verrucose surface; thin margin;: prothallus. Apothecia numerous: lecanorine (plate-shaped with a marginal ring); sessile; 2-3 mm diameter.
Growing on fallen tree branch that was ca. 2.5-2.5cm diameter.
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Thanks Steve. I don't usually see the apothecia of this lichen so mature so this was a treat.