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Literature:
 
Page number:241 
Remarks (internal):The race of E. magnicellulata on Phlox is native to North America. It was introduced in different parts of the world, including Europe. The race on Polemonium is native to Europe as well as North America. Both races are morphologically largely agreeing. 
Description type:Non-original description 
Description:Erysiphe magnicellulata U. Braun, Feddes Repert. 88(9-10), p. 656 (1978)
(a) var. magnicellulata
Syn.: E. cichoracearum auct. p. p. E. cichoracearum f. phlogis Jaczewski (1927, p. 221), f. polemonii Jacz. (l.c., p. 229). E. cichoracearum var. magnicellulata (U. Braun) U. Braun, NovaHedw. 34, p. 695 (1981). E. martii f. phlogis Thüm., Myc. univ. 449, nom. nud. ?E. phlogis Schw., nom. dub.
Anamorph: Oidium drummondii Thüm., Myc. univ., cent. XII, No. 1177, Klosterneuburg 1878.
Ill.: Braun (l.c., fig. 1,2); Gorlenko et al. (1976,p. 160, pl. 17, fig. 3) ; Salata (1985,p. 125, fig. 51, pl. VIII).
Lit.: Schmitt (1955); Schüpp & Blumer (1963); Gorlenko (1974); Nagy (1975); Bunkina (1979, p. 57); Braun (1980c, p. 79); Vasjagina (1982); Salata (1985, p. 125).
Exs.: Ell. & Ev., F. Columb. 312. Fungi of Oregon 1026. Kochm., Myc. Polon. 575. Kochm. & Salata, Myc. Polon. 657. Rav., F. Car. Exs. 69. Thüm., Myc. univ. 449.
Mycelium on stems and leaves, amphigenous, appearance very characteristic, dense, white, persistent patches, often confluent, sometimes covers, leaves often characteristically "maculate", conidiophores erect, foot-cells cylindric, ca (30-)40-80(-110) x 9-13 µm, followed by 1-3 shorter cells, appressoria nipple-shaped, conidia in chains, ellipsoid-cylindric, ca 26-35 x 14-18 µm, germ tubes arising from an end, relatively short and often ± clavate. Cleistothecia gregarious or subscattered, the ascocarps often form dense, dark patches or even covers on the host leaves, size variable, 80-160(-180) µm in diam, cells conspicuous, shape irregular, rather large, ca 10-35 µm diam, appendages numerous, in the lower half of the ascocarp, rarely partly in the upper half, mycelioid, 0.5-2.5(-4) times as long as the cleistothecial diam, thin-walled, smooth, septate, simple, rarely branched, ca 5-12 µm wide, mostly 6-10 µm, hyaline, later coloured, brown throughout or paler in the upper part, appendages interlaced with each other and with the mycelium, asci numerous, ca 10-25, shortly stalked, 40-85 x 25-50 µm, 2-spored, rarely 3 or 4 spores, ellipsoid-ovoid to subglobose, (16-)18-29(-31) x 13-20 µm. Pl. 62, fig. B.
Holotypus: on Phlox paniculata L., GDR, Rehfelde near Berlin, garden, 25-91976, Braun (HAL).
Isotypi: LE, K, NY, JE.
Hosts and distr.: on Phlox (amoena, diffusa, divaricata, drummondii, gracilis, maculata, paniculata, procumbens, spec.), Polemonium (boreale, campanulatum, carneum, caucasicum, coeruleum s.lat., filicinum, foliosissimum, reptans, spec.), Polemoniaceae; nearly all Europe, Asia (Central Asia, Siberia, Far East of the USSR, Japan), all North America (USA, Canada), furthermore, the race on Phlox is introduced in many parts of the world wherever Phlox is grown for ornament (e. g. Australia, Fiji, Egypt, Israel, some parts of Africa).
 
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