Abstract
THE circular black spots on the leaves of the sycamore, Acer pseudoplatanus, caused by attack by the fungus Rhytisma acerina, form such a familiar feature in the foliage of that tree that they are apt to be regarded as natural marks, like those on the mottled leaves of Pulmonaria officinalis.
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MAXWELL, H. The Sycamore Fungus. Nature 132, 409 (1933). https://doi.org/10.1038/132409a0
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DOI: https://doi.org/10.1038/132409a0
