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Wirth, V 1970: Studien zu den silicolen Opegrapha-Arten O. horistica, O. zonata und O. gyrocarpa. - Herzogia 1: 469-475. [RLL List # 77 / Rec.# 20367]
Keywords: OPEGRAPHA/ SAXICOLOUS
Abstract: On the basis of the type it is demonstrated that the silica lichen Opegrapha zonata Koerb. represents a nomen confusum, this name is therefore illegitime. Most of the quotations in the literature refer to O. horistica (Leight.) Stein, and in some cases to O. gyrocarpa Flot. The diagnostically important characteristics of O. horistica and O. gyrocarpa are outlined. 1 fig.

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