. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON THESIUM 229 iEcidia on Geranium pusillum, and possibly also on G. molle, G. rotundifolium; uredo- and teleutospores on Polygonum Con- volvulus, August and September. Uncommon. (Fig. 17().) The connection of the jecidium on tlie tirst-named host and the Puccinia on Pol. Convolvulus has been experimentally demonstrated by Tranzschel. It is possible that the same parasite also attacks P. dume- torum, P. Persicaria and others. The secidium is not known for certain to have occurred in Britain. The teleuto-sori of
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON THESIUM 229 iEcidia on Geranium pusillum, and possibly also on G. molle, G. rotundifolium; uredo- and teleutospores on Polygonum Con- volvulus, August and September. Uncommon. (Fig. 17().) The connection of the jecidium on tlie tirst-named host and the Puccinia on Pol. Convolvulus has been experimentally demonstrated by Tranzschel. It is possible that the same parasite also attacks P. dume- torum, P. Persicaria and others. The secidium is not known for certain to have occurred in Britain. The teleuto-sori of P. Polygoni-Convolvuli are distinguished from those of P. Polygoni-amphibii by their compact pulvinate form, and by being soon uncovered by the epidermis, while the spores (perhaps in consequence of that) are much darker at the summit, and the apex, if conical, is less often oblique. According to Sydow these distinctions, however true they may be of the European forms of the species, do not avail when the extra-European forms are considered. In the Monographia, therefore, the two species are united, and only culture experiments will be able to decide the question. 99. Puccinia Thesii Chaill. ^cidium Thesii Desv. in Journ. de Bot. ii. 311 Cooke, Handb. p. 537 ; Micr. Fung. p. 195, pi. 3, f. 50—1. Puccinia Thesii Chaill. in Duby, Bot. Gall. ii. 889. Cooke, Handb. p. 495 ; Micr. Fung. p. 204. Plowr. Ured. p. 145. Sacc. Syll. vii. 602. Sydow, Monogr. i. 585. Fischer, Ured. Schweiz, p. 300, f. 219. Spermogoues. Amphigenous, numerous, amongst the Fig. 177. P. Tliesii. Teleutospores, from a Surrey specimen. ^-Ecidiospores. iEcidia amphigenous, scattered uniformly and rather thickly over the whole leaf-surface, seldom in roundish. 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 Bywat
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