. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON POLYGONACE^E 115 U. Rumicis Wint. Krypt. Fl. i. 145. 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 fi, with two (more often three) germ-pores. Fig. 67_ Um Rumicis, Teleuto- Teleutospores. Sori similar. sPores and uredospore, on R. obtuslfolius.
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON POLYGONACE^E 115 U. Rumicis Wint. Krypt. Fl. i. 145. 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 fi, with two (more often three) germ-pores. Fig. 67_ Um Rumicis, Teleuto- Teleutospores. Sori similar. sPores and uredospore, on R. obtuslfolius. but darker; spores subglobose to pvriform, with a hemispherical hyaline papilla, often narrowed below, smooth or nearly so, brown, 24—35 x 18—24 yu.; epispore rather thick ; pedicels thin, hyaline, deciduous. On Rumex conglomeratus, R. crispus, R. Hydrolapathum, R,. nemorosus, R. obtuslfolius, 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. Rtimicis 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. fusca and P. Pruni-spinosae, whose teleutospores are equally alike. In 1905 he reported that he had produced an secidium on Ranunculus Fiearia from the spores of U. Rumicis ; still later, he repeated this statement (1909), and added that he had infected Rumex obtusifolhis with secidio- spores from R. Fiearia. Other experimenters (Bubak, Krieg) have been unable to repeat the former of these infections ; they could only produce the secidium on R. Fiearia with the spores of Uromyces Poae. It has been suggested that there are two eecidia on R. Fiearia, one belonging to U. Poae and the other to U. Rumicis; I have
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