. The British rust fungi (Uredinales), their biology and classification. Uredineae. 48 PUCCINIA MALVACEARUM and overhanging it some Coltsfoot affected by the secidium : another tuft about ten yards off can be used as a control. The uredo- and teleutospores will appear on the former tuft in about 14 to 21 days. If this is done late in the year (September) I have found that only teleutospores are formed on the leaves of the Poa. For the germinating secidiospores see Figs. 27, 28. Puccinia Malvacearum. The Hollyhock Rust. This Rust differs from all the others that will be mentioned in the simplic
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 48 PUCCINIA MALVACEARUM and overhanging it some Coltsfoot affected by the secidium : another tuft about ten yards off can be used as a control. The uredo- and teleutospores will appear on the former tuft in about 14 to 21 days. If this is done late in the year (September) I have found that only teleutospores are formed on the leaves of the Poa. For the germinating secidiospores see Figs. 27, 28. Puccinia Malvacearum. The Hollyhock Rust. This Rust differs from all the others that will be mentioned in the simplicity of its life-history, and also in the fact that it is not confined (as almost all the others are) to one kind of plant or even to a few, but ap- pears, so far as is known at present, to range over the greater part of a sub-family. It has been found on over 50 species belonging to nearly all the genera of the Malvese, and it seems to be identically the same in every case. The mycelium develops in spring in the intercellular spaces of the young leaves and stems and produces little knots under the epidermis, on which a thick, round, hard, pale-reddish cushion of teleutospores is formed. These spores have short or very long pedicels according to their posi- tion ; they are mostly typical and two-celled, but mesospores with only one cell are not uncommon, and occasionally a few may be met with having three or even Fig. 29. P. .Malvacearum. Ger- four cells. Most of them gemii- minating spore; a, a, basidium ^ate at once, in the SOruS, pro- breaking up into separate cells; . . h. a basidiospore, x 600. ducmg basidiospores m the usual. 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, William Bywater. Cambridge, Univ. Press
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