Abstract
X. IN the months of April and May, the younger needle-like leaves of the Scotch pine are occasionally seen to have assumed a yellow tinge, and on closer examination this change in colour, from green to yellow, is seen to be due to the development of what look like small orange-coloured vesicles standing off from the surface of the epidermis, and which have in fact burst through from the interior of the leaf (Fig 31). Between these larger orange-yellow vesicles the lens shows certain smaller brownish or almost black specks. Each of the vesicular swellings is a form of fungus-fructification known as an Æcidiuim, and each of the smaller specks is a fungus-structure called a Spermogonium, and both of these bodies are developed from a mycelium in the tissues of the leaf. I must employ these technical terms, but will explain them more in detail shortly: the point to be attended to for the moment is that this fungus in the leaf has long been known under the name of Periaermium Pini (var. acicola, i.e. the variety which lives upon the needle-like leaves).
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WARD, H. Timber, and Some of its Diseases 1 . Nature 38, 297–299 (1888). https://doi.org/10.1038/038297b0
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DOI: https://doi.org/10.1038/038297b0