. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POLYGONACE^ 115 U. Rumicis Wint. Krypt. Fl. i. U5. Plowr. Ured. p. 135 Sacc. Syll. vii, 544. Sydow, Monogr. ii. 238. Fischer, Ured. Schweiz, p. 9, f. 8. Uredospores. Sori amphigenous, on coloured spots, round, minute, scattered, soon naked, pulverulent, cinnamon; spores subglobose to ellipsoid, sparsely echinulate, pale-brown, 20—28 x 18—24 fl, with two (more often three) germ-pores. Fig. gy jr. jiamicis. Teleuto- Teleutospores. Sori similar. ^Pores and uredospore, on R. obtusifolius. but darker; spores
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POLYGONACE^ 115 U. Rumicis Wint. Krypt. Fl. i. U5. Plowr. Ured. p. 135 Sacc. Syll. vii, 544. Sydow, Monogr. ii. 238. Fischer, Ured. Schweiz, p. 9, f. 8. Uredospores. Sori amphigenous, on coloured spots, round, minute, scattered, soon naked, pulverulent, cinnamon; spores subglobose to ellipsoid, sparsely echinulate, pale-brown, 20—28 x 18—24 fl, with two (more often three) germ-pores. Fig. gy jr. jiamicis. Teleuto- Teleutospores. Sori similar. ^Pores and uredospore, on R. obtusifolius. but darker; spores subglobose to pyriform, with a hemispherical hyaline papilla, often narrowed below, smooth or nearly so, brown, 24—85 x 18—24/x; epispore rather thick; pedicels thin, hyaline, deciduous. On Rumex conglomeratus, R. crispus, R. Hydrolapathum, R. nemorosus, R. obtusifolius, and perhaps others. May— September. Common. (Fig. 67.) The spots on the leaves are small, round, and of various colours ; often the chlorenchyma in the immediate neighbourhood retains its green colour long after the rest of the leaf has become faded and yellow. It will be noticed that the spores of U. Rumicis are exactly like those of U. Ficariae, and for this reason Tranzschel was led to suspect some connection between the two, such as he demonstrated to exist between P. fiisca and P. Pruni-spinosae, whose teleutospores are equally alike. In 1905 he reported that he had produced an secidium on Ranunculus Ficaria from the spores of U. Rumicis ; still later, he repeated this statement (1909), and added that he had infected Rumex ohtusifolitis with gecidio- spores from R. Ficaria. Other experimenters (Bubak, Krieg) have been unable to repeat the former of these infections ; they could only produce the eecidium on R. Ficaria with the spores of Uromyces Poae. It has been suggested that there are two secidia on R. Ficaria, one belonging to U. Poae and the other to U. Rumicis; I have tried to infect R. obt
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