. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. General distribution: Europe. On Mercurialis perennis L. - EUROPEAN PART: Lad. -Ilm., U. V., V. -Don., V. -Kama, M. Dnp., Crim., Bait., U. Dns. On Populus tremula L. - EUROPEAN PART: Lad. -Ilm. The connection of aecia on Mercurialis perennis with II and III on Populus tremula was first established by Rostrup and later confirmed by Plowright, Wagner, Klebahn, and Jacky. 21. Melampsora pruinosae Tranz., Tranzschel et Serebriannikov, Mycotheca rossica. No. 265, 1912; Syd., Monogr. Ured. Ill, 1915. p. 345; Sacc, Sylloge, XX
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. General distribution: Europe. On Mercurialis perennis L. - EUROPEAN PART: Lad. -Ilm., U. V., V. -Don., V. -Kama, M. Dnp., Crim., Bait., U. Dns. On Populus tremula L. - EUROPEAN PART: Lad. -Ilm. The connection of aecia on Mercurialis perennis with II and III on Populus tremula was first established by Rostrup and later confirmed by Plowright, Wagner, Klebahn, and Jacky. 21. Melampsora pruinosae Tranz., Tranzschel et Serebriannikov, Mycotheca rossica. No. 265, 1912; Syd., Monogr. Ured. Ill, 1915. p. 345; Sacc, Sylloge, XXIII, 1925, p. 840; Tranzschel, Consp. Ured. URSS, Moscow, 1939, p. 155. Spermagonia and aecia unknown. Uredia amphigenous, on small dark patches, scattered over the entire frond, pale orange-colored, minute, in groups, rarely solitary. Urediospores globoid, ovoid or ellipsoid, coarsely verrucose, 20—28X16—IBjLt; wall evenly thick, 3 —4/x. Paraphyses capitate or clavate, colorless, 45 —60pi long, head-width 16—20/j ; wall uniformly thick, — )u (Figure 142). Telia amphigenous, subepidermal, usually small, reddish-brown. Teliospores prismatic, pale yellowish, 40 —50X 10 — 13m. not thickened at apex. Uredio- and teliospores on Populus pruinosa Schrenk and P. euphratica Oliv. General distribution: Europe, Asia (Central Asia). On Populus pruinosa Schrenk - EUROPEAN PART: L. V.; CENTRAL ASIA: Syr D. (Tashkent), Kara K., Amu D. piedmonts (Parab). On (?) Populus euphratica Oliv. — CENTRAL ASIA: Kara K. On Populus sp. - CENTRAL ASIA: Kara K. (Murgab Valley). The species is close to the type species of Melajmpsora tremulae and distinguished from it by the thick-walled urediospores. This feature is oco apparently connected with the drier climate at the site of origin, for on Populus alba, in Central Asia, urediospores are also thicker-walled than in Europe (annotation by V. G. Tranzschel).. FIGURE 142. Melampsora pruinosae Tranz. on Populus pruinosa Schrenk. Telio-
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