. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. 173 Spermagonia and aecia unknown. Uredia round or slightly elongate, — mm across, subepidermal, occasionally in linear rows on olive or brown patches on the leaves, scattered or loosely grouped; peridium hemispherical, delicate; peridial cells in upper part of peridium irregularly angular, isodiametric or slightly elongate, in the lower part radially elongate, 8 —17/u across, with walls less than 1/u thick. Urediospores on short pedicels, obovoid, ellipsoid, rarely pyriform or almost globoid, 28 — 47 X 17—20/Li (
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. 173 Spermagonia and aecia unknown. Uredia round or slightly elongate, — mm across, subepidermal, occasionally in linear rows on olive or brown patches on the leaves, scattered or loosely grouped; peridium hemispherical, delicate; peridial cells in upper part of peridium irregularly angular, isodiametric or slightly elongate, in the lower part radially elongate, 8 —17/u across, with walls less than 1/u thick. Urediospores on short pedicels, obovoid, ellipsoid, rarely pyriform or almost globoid, 28 — 47 X 17—20/Li (on an average, 35 X 20lu); wall, — )u thick, rather strongly echinulate; echinules sometimes unevenly scattered (Figure 9). Teliospores unknown. OnAsplenium (Adiantum) nigrum L., in France (the Riviera, Corsica) and Italy (Liguria). In the USSR the host is found in the Caucasus, the Crimea (rarely), near Kamenets-Podol'skii, and in Tien Shan. 3. Milesia mur ariae (Magn.) Faull. , 1932, ,a —d; Tranzschel, Consp. Ured. URSS, Moscow, 1939, p. 63 —65. Syn. : Milesina murariae (P. Magn.) Syd., Monogr. Ured. Ill, 1915, p. 477; Grove, Journ. Bot. LIX, 1921, p. 311; Fragoso, Fl. Iber. Ured. II, 1925, p. 279; Hirats., Monogr. Pucciniastreae, 1936, p. 128, tab. IV, fig. 3. Uredo murariae P. Magn., Ber. Deutsch. bot. , 1902, ; Fischer, Ured. Schweiz, 1904, S. 538; Harlot, Ured., 1908, p. 310; Klebahn, Kryptogfl. M. Brandb. Va, 1914, S. 855, Fig. V, 5; Trotter, Fl. Ital. Crypt. Ured., 1914, p. 452. Spermagonia and aecia unkn-^wn. Uredia hypophyllous and petiolicolous, round, — mm across, or elongate, up to 3 mm long, on petioles and petiolules, subepidermal, on olive or brownish areas frequently involving entire fronds; peridium hemispherical, rather compact; peridial cells in the upper part of peridium irregularly angular, isodiametric or slightly elongate, in the lower part of peridium radially elongate, 7 — 15^ across; walls,
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