. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. 226. Aecidixim ingenuum Arth., Bull. Torrey Bot. Club, XI, 1919, p. 124. Peridermium ingenuum Arth. ex Rhoads, Hedgcock, Bethel a. Hartley, Phytopathology, VIII, 1918 (l), p. 336 (sine diagnosi); Syd., Monogr. Ured. IV, 1923, p. 3; Arth., N. Amer. Fl. VII, 1924; p. 646; Sacc, Sylloge, XXIII, 1924, p. 3. Biol. Darker, Journ. Arn. Arb. X, 1929, p. 156; Hunter, Journ. Arn. Arb. XVII, 1936, p. 122, fig. 12 (spermagonium). Spermagonia hypophyllous, discoid, inconspicuous, subcuticular, 80 — 1 SOjj, across, 40 —50 ju high. Sp
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. 226. Aecidixim ingenuum Arth., Bull. Torrey Bot. Club, XI, 1919, p. 124. Peridermium ingenuum Arth. ex Rhoads, Hedgcock, Bethel a. Hartley, Phytopathology, VIII, 1918 (l), p. 336 (sine diagnosi); Syd., Monogr. Ured. IV, 1923, p. 3; Arth., N. Amer. Fl. VII, 1924; p. 646; Sacc, Sylloge, XXIII, 1924, p. 3. Biol. Darker, Journ. Arn. Arb. X, 1929, p. 156; Hunter, Journ. Arn. Arb. XVII, 1936, p. 122, fig. 12 (spermagonium). Spermagonia hypophyllous, discoid, inconspicuous, subcuticular, 80 — 1 SOjj, across, 40 —50 ju high. Spermatia — — Aecia hypophyllous, at times amphigenous, thickly set, frequently con- fluent; peridia almost cylindrical or ligulate, — mm high, very delicate and brittle; peridial cells narrow-elongate or linear in radial section, 32—47X14—21 )u, somewhat overlapping, outer walls 1—2juthick, smooth, inner walls 3 —5;u thick, densely verruculose. Aeciospores globoid or broad-ellipsoid, 1 7—2 5 X14 —18^^; walls colorless, 2— 3/u thick, half the thick- ness consisting of thickly set, rather thin, partly deciduous rods. Uredia hypophyllous, scattered or in groups, occasionally covering extensive parts of the leaves, round, small, — mm across, yellow, covered by hemispherical peridia; peridial cells small, somewhat elongate, thin-walled, smooth; lower wall of cells adjoining peridial ostiole thicker; ostiolar cells of peridia thick-walled, coarsely echinulate. Urediospores ovoid or oblong-ovoid, 1 7— 27 X 12 — 1 6ju; walls color- less, echinulate, with yellow contents; pore barely perceptible (Figure 47). Telia hypophyllous. Teliospores in small groups intercellular, subepi- dermal, globoid or angular, 2- to 4-celled, 19 — 2 5^^ across; walls brownish, smooth. Teliospores develop late, and are rarely detected. On species of Rubus. General distribution: Europe, Asia, North America. On Rubus arcticus L. - EUROPEAN PART: Kar.
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