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Page number:82 
Remarks (internal):In a few cases, conidia forming secondary conidiophores and conidia by microcyclic conidiogenesis have been found. This phenomenon usually occurs under high humidity. BONTEA (1985) recorded Sorbus domestica as host of this species. Malus spp. are also known to be hosts of Fusicladium pyrorum, e.g., in the types of F. fuscescens and Cercospora porrigo, but the correct determinations of these hosts could not be proven. 
Description type:Non-original description 
Description:Fusicladium pyrorum (Lib.) Fuckel, Jahrb. Nassauischen Vereins Naturk. 23-24: 357 '1869' (1870), as 'Fusicladium pyrinum' Fig. 41
= Helminthosporium pyrorum Lib. (p.p.), Pl. crypt. ard., Fasc. 2, 188 (1832); lectotype: on leaves of Pyrus communis, Pl. crypt. ard. 188 (DAOM).
= Passalora 'pyrina' (Lib.) Sacc., Michelia 1: 537 (1879).
= Megacladosporium pyrorum (Lib.) Vienn.-Bourg., Les Champignons parasites des plantes cultivées 1: 489 (1949), as 'Megacladosporium pirinum'.
= Arthrinium pyrinum Wallr., Fl. crypt. Germ. 2: 163 (1833); holotype: herb. Wallroth (STR); isotype: IMI 68300.
= Fusidium pyrinum Corda, Icon. fung. 1: 3 (1837); type: PR.
= Fusicladium virescens Bonord., Handb. Mykol.: 80 (1851); iconotype: Bonorden, l.c.: Fig. 94.
= Cladosporium polymorphum Peyl, Lotos 15: 18 (1865).
= Fusicladium fuscescens Rabenh., Bot. Zeitung (Berlin) 15: 430 (1857); syntypes: on leaves of Malus domestica (= Pyrus malus), Germany, Dresden, autumno, L. Rabenhorst, Herb. mycol. 588 (HAL, HBG).
= Passalora pomi G.H. Otth, Mitth. Naturf. Ges. Bern 1868: 66 (1868); type: on leaves of Pyrus coronarius, Swiss, Bern.
= Fusicladium pyrorum [(Lib.) Fuckel] var. cladophilum Ellis & Everh., North Am. Fungi 2791 (1892); syntypes: on twigs of Pyrus communis, USA, Wisconsin, Pewankee, May 1890, Geo P. Pfeiffer, Ellis & Everh., N. Am. F. 2791 (M, NY).
= Cercospora porrigo Speg., Anales Mus. Nac. Buenos Aires. II. 3: 341 (1899); holotype: on fruits of Malus domestica (= Pyrus malus), Argentina, prov. Buenos Aires, La Plata, Nov. 1894, C. Spegazzini, no. 934 (LPS).
= Fusicladium pyrorum [(Lib.) Fuckel] f. carpophila Sacc., Mycoth. ital. 992 (1901); syntype: on fruits of Pyrus communis, Italy, Selva, Treviso, Aug. 1901, D. Saccardo, Mycoth. ital. 992 (B).
= Acrotheca dearnessiana Sacc., Ann. Mycol. 10: 314 (1912); syntype: on Aronia melanocarpa (= Pyrus melanocarpa), Canada, Ont., London, Aug. 1910, J. Dearness, Barthol., F. Columb. 5001 (IMI 7073).
= Fusicladium dearnessianum (Sacc.) M.B. Ellis, in herb.
Teleomorph: Venturia pyrina Aderh., Landw. Jahrb. 25: 875 (1896), as 'pirina'.
Lit.: LINDAU (1907: 781-782), FERRARIS (1912: 313), VASSILJEVSKY & KARAKULIN (1937: 195-196), HUGHES (1953: 566-567; 1958: 768), BARR (1968: 811-812), SUBRAMANIAN (1971: 234), Fungi Canadenses (No. 36), CMI Descr. (No. 404), SIVANESAN (1977: 94-99; 1984a: 620-621).
Ill.: BONORDEN (1851: 80, Fig. 94), ADERHOLD (1896: Figs 51-53, Pl. 1, E & F), BRIOSI & CAVARA (F. paras. 43, Figs 1-3), FERRARIS (1910: 313, Fig. 99), VASSILJEVSKY & KARAKULIN (1937: 196, Fig. 13), HUGHES (1953: 565, Fig. 5; 567, Fig. 6), BARR (1968: 805, Fig. 21), ELLIS (1971: 272, Fig. 186), SUBRAMANIAN (1971: 234, Fig. 203), Fungi Canadenses (No. 36), CMI Descr. (No. 404: 1, Figs D, E), SIVANESAN (1977: 98, Fig. 53; 1984a: 621, Fig. 375), ARX (1987: 59, Fig. 28), SAGDULLAEVA et al. (1990: 52, Fig. 6).
Exs.: Barthol., F. Columb. 4700, 5001; Briosi & Cav., F. paras. 43; Crypt. exs. 4104; Ellis, N. Am. F. 372; Ellis & Everh., N. Am. F. 2791; Erb. Critt. Ital. 696; Fl. Gall. Germ. exs. 597; Fl. Olten. exs. 568; Fuckel, F. rhen. 1517; F. est. 28825; Herb. Mycol. Rom. 1196, 1457; Jaap, F. sel. exs. 683; Krieger, F. sax. 344, 2447; Krypt. exs. 1496, 4104; Lin., F. hung. 293; Migula, Crypt. Germ. Austr. Helv. exs. 382; Petr., F. alban. bosn. exs. 13; Rabenh., F. eur. 1168; Rabenh., Herb. mycol. 588; Reliqu. Petrak. 2159; Roum., F. gall. exs. 1868; Sacc., Mycoth. ital. 992; Sacc., Mycoth. Ven. 585; Schmarotzerp. Ruhrg. 58, 114; Seym. & Earle, Econ. F. 39; Syd., Mycoth. germ. 1782; Syd., Mycoth. march. 800; Thüm., F. austr. 276; Thüm., Herb. myc. oec. 224.
On leaves and fruits, rarely on young twigs and buds, leaf spots scab-like, amphigenous, diffuse, subcircular, olivaceous to dark brown or almost black, surrounded by a paler brown halo. Colonies amphigenous, caespitose, velvety, dark brown to olivaceous-brown. Mycelium subcuticular, hyphae branched, 3 µm wide, septate, pale brown. Stroma almost lacking to well developed, stromatic cells 4-11 µm diam., dark brown, thick-walled. Conidiophores solitary or in loose fascicles, arising from stromata, erect, straight to flexuous, geniculate-subnodulose, unbranched, 11-70(-90) x 4-11 µm, 0-1-septate, olivaceous to dark brown, paler towards the apex, smooth, slightly rough-walled with age, thick-walled. Conidiogenous cells integrated, terminal or intercalary, with numerous conidiogenous loci, proliferation sympodial, loci denticulate, short cylindrical, truncate or somewhat convex, 1-3 µm wide, walls unthickened or almost so, slightly darkened-refractive. Conidia solitary, very rarely in unbranched chains, fusiform to pyriform, ellipsoid to obovoid, straight to slightly curved, 10-34 x 5-11 µm, 0-1(-2)-septate, olivaceous to pale brown, smooth, later somewhat rough-walled, pointed at the apex, truncate at the base, hila 1-3(-4) µm wide, unthickened or slightly thickened, somewhat darkened-refractive.

Hosts and distribution: on Aronia, Chaenomeles, Eriobotrya, Malus and Pyrus spp. (Rosaceae), cosmopolitan - Aronia melanocarpa (North America, Canada, Ont.), Chaenomeles speciosa (North America, USA, OK), Eriobotrya japonica (Europe, GB), Malus domestica (Europe, D; South America, Argentina), Pyrus amygdaliformis (Europe, F, TR), P. bucharica (Central Asia, Tadzhikistan, Uzbekistan), P. caucasica (Caucasus, Georgia), P. communis (= P. sativa) (Asia, Israel, Lebanon, Iran, Iraq, Afghanistan, Russia, Kazakhstan, Kirghizia, Uzbekistan, Turkmenistan, Tadzhikistan, China, India, Korea, Japan, Taiwan; Caucasus, Armenia, Azerbaijan, Georgia; Europe, A, AL, BG, CH, CZ, D, DK, EW, F, GB, H, I, LT, LV, P, RO, RUS, SLO, TR, Ukr., YU, Byelorussia, Moldavia, Malta, Cyprus; Canary Islands; Africa, Libyan, Morocco, Mozambique, South Africa, Madagascar; North America, Canada, BC., NB., NS., Ont., Que., PEI, USA, FL, MA, WI; South America, Columbia, Argentina, Chile; Australia, New South Wales, Queensland, Tasmania, Victoria; New Zealand;), P. coronarius (Europe, CH), P. korshinskyi (Central Asia, Uzbekistan), P. mamorensis (Africa, Morocco), P. pyraster (Europe, RO), Pyrus spp. (Asia, China; Europe, EW).
Material examined: on Eriobotrya japonica, Europe, Great Britain, Surrey, Wisley, 23 Dec. 1966, A.V. Brook (IMI 123946), on Pyrus spp. collections from B, G, HBG, IMI, J, LE, M.
 
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