. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 382 HEMILEIA On leaves of Gattleya Dowiana Batem., imported from Costa Rica, 1899. (Fig. 285.) Only a small patch of Rust was present on the leaf when the plant was received from Costa Rica, but this continued to increase in size and the falling spores infected other leaves. The uredospores germinated readily, and young Gattleya leaves, inoculated on the under surface, produced mature uredospores in thirteen days. No success attended the efforts to infect other orchids, not belonging to the genus Gattleya. This
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 382 HEMILEIA On leaves of Gattleya Dowiana Batem., imported from Costa Rica, 1899. (Fig. 285.) Only a small patch of Rust was present on the leaf when the plant was received from Costa Rica, but this continued to increase in size and the falling spores infected other leaves. The uredospores germinated readily, and young Gattleya leaves, inoculated on the under surface, produced mature uredospores in thirteen days. No success attended the efforts to infect other orchids, not belonging to the genus Gattleya. This description is founded on that given in the Kew Bulletin; on referring to the Gardener's Chronicle (?.c.) it will be seen that the particulars there given differ in several respects. The specimen is in the Kew Herbarium. This fungus and the others of the same genus might easily become dangerous parasites in orchid houses, if allowed to spread; though it seems probable, on the slender evidence at present known, that each is confined, like most other Rusts, to a single genus, if not species. Hemileia Phaji Sydow. Vredo Raciborski, Parasit. Alg. und Pilz. 1900, ii. 32. U. Lynchii Adams, Irish Naturalist, 1911, xx. 68. Hemileia Phaji Sydow, Monogr. iii. (ined.). Grove, Jourri. Bot. 1913, p. Fig. 286. H. Phaji. a, epidermis, showing fascicle of uredospores emerging from a stoma, x 180 ; b, the same in section ; c, uredospores, x 600 ; d, a portion of a leaf, with uredo-sori, in Herb. Kew, x J. Uredospores. Sori hj'pophyllous, densely scattered, round, distinct, formed of little dense fascicles of hyphi^ (20—25) which issue through a stoma; pedicels divergent, clavate up- wards, each surmounted by a spore; spores subglobose or rarely. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Grove, W. B. (Wil
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