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Remarks (internal):Blumer (1933) reported a collection on "Catalpa syringaefolia" (ex herb. Magnus, GDR, Eisenach, 1891) which, according to the description, belongs to the present species. 
Description:Erysiphe catalpae Simonian, Mikol. i Fitop. 18(6), p. 463 (1984)
Syn.: E. communis f. bignoniae Jaczewski (1927, p. 231), nom. nud.
Anamorph: Oidium bignoniae Jaczewski, Jezegodnik sevednij o boles. rast. V, p. 247 (1909).
Ill.: Gorlenko (1983, p. 27, fig. 6); Simonian (l.c., p. 464, fig. 1).
Lit.: Simonian (1959); Bunkina (1979, p. 64); Gorlenko (1983).
Mycelium amphigenous, persistent, round definite patches, later covering the entire surface of the leaves, conidiophores straight, foot-cells cylindric, about 2840 x 11-14 µm, followed by 1-2 cells of nearly the same length, conidia formed singly, ellipsoid to doliform, 26-40 x 14-21 µm, l/w ratio 1.3-2.7. Cleistothecia scattered to gregarious, (70-)90-125(-160) µm in diam, cells irregularly polygonal, ca 10-25 ,um diam, appendages not very numerous, in the lower half, rather coarse, often stiff and straight, especially the shorter ones, aseptate or few septa, simple, rarely irregularly branched, ca 4.5-9.5 µm wide, 0.5-1.5 times as long as the cleistothecial diam, hyaline, later brown, short appendages coloured throughout, longer ones brown below and paler above, thin-walled, smooth to faintly rough, asci 3-8, sessile or shortly stalked, 60-85 x 23-38 µm, 3-5-spored, spores ellipsoid or subglobose, 17-27x 14-18 µm. Pl. 50, fig. A.
Holotypus: on Catalpa bignonioides L., USSR, Armenia, Yerevan Botanical Garden, 9-10-1957, Simonian (EREM 1710).
Isotypus: HAL.
Hosts and distr.: on Catalpa (bignonioides, speciosa), Bignoniaceae; Europe, scattered (France, GDR, Holland, Italy, Yugoslavia, Romania, European part of the USSR), Armenia, Far East of the USSR.
 
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