The Fruticose Species of Usnea Subgenus Usnea in East Africa

T. D. V. Swinscow; Hildur Krog

doi:10.1017/S0024282979000293

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The Fruticose Species of Usnea Subgenus Usnea in East Africa

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The Fruticose Species of Usnea Subgenus Usnea in East Africa

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