. The British rust fungi (Uredinales), their biology and classification. Uredineae. 102 UROMYCES On leaves of Phaseolus vulgaris. May, July—October; even earlier on forced plants. Uncommon. (Fig. 55.) De Bary () proved the genetic connection of the fecidia with the uredo- and teleutospores. The fecidia are rarely met with ; they may occur either before or in company with the other spore-forms. I have seen no proof that they have been found in this country. The description is founded upon that of Sydow. Fischer says that this species is very common in Switzerland on Phaseolus; it may become
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 102 UROMYCES On leaves of Phaseolus vulgaris. May, July—October; even earlier on forced plants. Uncommon. (Fig. 55.) De Bary () proved the genetic connection of the fecidia with the uredo- and teleutospores. The fecidia are rarely met with ; they may occur either before or in company with the other spore-forms. I have seen no proof that they have been found in this country. The description is founded upon that of Sydow. Fischer says that this species is very common in Switzerland on Phaseolus; it may become a dangerous parasite on forced Beans. All affected plants (leaves and stems) should be burnt. U. appendiculatus of Sydow, which occurs on many Leguminosne, is probably a collective species, though no experiments bearing on this point are available. Distribution : as a collective species (U. appendiculatus) world-wide. 16. Uromyces tuberculatus Fckl. jEcidium Euphorhiae Gmel. in Linn. Syst. Nat. ii. 1473 Purton, Midi. Flor. iii. 293. Cooke, Handb. p. 537 ; Micr. Fung. p. 195 Plowr. Ured. p. 270. Uromi/ces excavatus DC.; Cooke, Grevillea, ii. 161 ; Micr. Fung. p. 213. U. tuberculatus Fckl. Symb. Myc. p. 64. Sydow, Monogr. ii. 165. Fischer, Ured. Schweiz, p. 43, f. 33. U. proeminens Lev. ; Sacc. Syll. vii. 553 Hypophyllous, spread uniformly over the Spermogones 1 jEcidiospores i whole leaf; tecidia immersed, cup-shaped, with a short denticu- late margin; spores orange, densely verruculose, 17—25 x 14— 20/u. Uredospores. Sori hypophyllous, scattered, at length naked, cinnamon; spores more or less globose, yellowish-brown, aculeo- late,20—25/x: epispore 1^—2|//, thick, with 5—7 swollen germ- pores (4—5, Fischer). Teleutospores. Sori amphi- genous and on the stems, round, scattered or sometimes arranged in little groups, pulverulent, blackish-brown or black; spores globose to ellipsoid, occasionally. Fig. 56. IJ. tuberculatus. Two ma- ture teleutospores
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