. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Spermagonia and aecia probably on Abies lasiocarpa (Hook.) Nutt. Uredio-i and teliospores on Athyrium cyclosorxim Rupr. in western Canada and in the northwestern From the main species — U. longimucro- nata Faull — the form cyclosorum is encountered in the eastern and in eastern Canada on Athyrium angustum (Willd.) Presl, distinguished by more elongate primary urediospores and larger amphispores. It might be found in the Far East. A. acrostichoides (Sw.) Diels occurs in the Soviet Far East (Uss.). A. filix-
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Spermagonia and aecia probably on Abies lasiocarpa (Hook.) Nutt. Uredio-i and teliospores on Athyrium cyclosorxim Rupr. in western Canada and in the northwestern From the main species — U. longimucro- nata Faull — the form cyclosorum is encountered in the eastern and in eastern Canada on Athyrium angustum (Willd.) Presl, distinguished by more elongate primary urediospores and larger amphispores. It might be found in the Far East. A. acrostichoides (Sw.) Diels occurs in the Soviet Far East (Uss.). A. filix-femina Roth var. cyclosorum Rupr. ranges from Scandinavia to Japan. 194 4. Uredinopsis copelandi Syd., Ann. mycol. II, 1904, p. 30; Sacc, Sylloge, XVII, 1905, p. 30; Arth., N. Amer. Fl. VII, 1907, ; Monogr. Ured. Ill, 1915, p. 30; Faull, Contr. Arn. Arb. XI, 1938, p. 39, tab. I, fig. 6, a —d; Tranzschel, Consp. Ured. URSS, Moscow, 1939, ,67. Spermagonia and aecia unknown. Primary uredia hypophyllous, round, — mm across; peridium delicate. Urediospores abundant, on very short pedicels, ellipsoid, obovoid, or fusoid, 27 —54X 11—16ij (averaging about 39 X 14/j), blunt or pointed, rarely with a short mucro; spore wall colorless, with 2 opposite rows of short thickly set verrucae; frequently with additional warts in incomplete vertical rows and scattered. Secondary urediospores in hypophyllous circular sori, developing after the sori, — in diameter; peridia rather delicate, opening late. Amphispores on elongate pedicels, angular-obovoid to irregularly polyhedral, 19 — 38 X 15 —27ju (on an average, about 26 X 20/u), with projections and denticules; spore wall densely and finely verrucose, — thick (Figure 24). Teliospores amphigenous, mostly hypophyllous, scattered, subepidermal, 1 - to 6-celled,usually 4-celled. On Athyrium cyclosoriom Rupr. (= A. filix-femina var. cyclosorum Rupr.) in California. This species is fr
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