This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Recently we noted where the spawn of a fungus had evidently been communicated from a lot of leaves from a wood to a lot of Rhododendrons, destroying large numbers of them. The same appears to have been noted in England in regard to other plants, as appears from the following from the pen of the Rev. J. M. Berkeley, in the Gardener's Chronicle: "The attention of cultivators cannot be called too often to the danger of supplying mould to trees in orchard-houses or hothouses. The white mycelium, which in such cases are found between the wood and bark, belongs to one of the higher fungi, and not to those parasites which affect leaves. Still it is quite true that these are often propagated by means of the soil, and for this reason it is recommended to gather and burn the leaves. This is notoriously true in the case of several of the fungi which attack cereals, and LÚveillÚ has shown that it is equally true of some of the yellow parasites; and so it is very probably true of the parasite affecting Peach leaves, which is Lecythea pruni, Lev., a species which is noticed in Gardeners' Chronicle, 1864, under the name of Uredo Castagnei, M., but which does not seem to have been inserted in any list of British species.
It is probably of exotic origin, for we have specimens from Port Louis, gathered by the late Mr. Ayers, and from Italy by Passerini, under the name of Uromyces prunorum, Fuckel. It was also sent from Valparaiso by Bridges, and Mr. Salway gathered it in Madeira. As regards the supposed fungus on Pear leaves, sent us by Mr. Sheppard, it is not a fungus but the work of a minute Acarus, allied to that which is so destructive to Black Currants".