Taxonomic circumscription of melanconis-like fungi causing canker disease in China Author Fan, Xinlei Author Du, Zhuo Author Bezerra, Jadson D. P. Author Tian, Chengming text MycoKeys 2018 42 89 124 http://dx.doi.org/10.3897/mycokeys.42.29634 journal article http://dx.doi.org/10.3897/mycokeys.42.29634 1314-4049--89 Juglanconis juglandina (Kunze) Voglmayr & Jaklitsch, Persoonia 38: 144 (2017) Fig. 3 ≡ Melanconium juglandinum Kunze, Fl. Dresd., 2. Aufl.: 260. 1823. Descriptions. Conidiomata acervular, immersed in host bark, erumpent from surface of host branches, scattered or occasionally confluent, 1.5-2.5 mm, covered by black discharged conidial masses at maturity, usually conspicuous. Ectostromatic disc straw to honey, surrounded by bark or not. Central column beneath the disc more or less conical, straw to buff. Conidiophores cylindrical to lageniform, simple, rarely branched at the base, smooth, subhyaline to pale brown. Conidiogenous cells annellidic with distinct annellations, integrated. Conidia unicellular, initially hyaline, becoming brown to blackish when mature, broadly ellipsoid to broadly pip-shaped, truncate with distinct scar at the base, densely multiguttulate, thick-walled, (17 -)19-22(- 24.5) x (9 -)11-14(- 16.5) μm (av. = 20 x 13 μm , n = 50), with 0.8-1 µm wide gelatinous sheath. Sexual morph was not observed. Figure 3. Morphology of Juglanconis juglandina from Juglans regia . A-B habit of acervuli on branches C transverse section through acervulus D longitudinal section through acervulus E-F conidiophores, conidiogenous cells and conidia. Scale bars: 1 mm ( A-D ), 20 μm ( E-F ). Culture characteristics. On PDA, cultures are initially white, becoming straw after 3-5 d and grey olivaceous after 7-10 d. The colonies are felty with an irregular edge; sterile. Materials examined. (all on twigs and branches of Juglans regia ). CHINA, Gansu Province, Qingyang City, Shishe village, 35°38'17.08"N , 107°47'48.68"E , 14 July 2013, X.L. Fan (BJFC-S908; living culture, CFCC 51727); Gansu Province, Qingyang City, Zhongwan Forest Farm, 35°26'26.33"N , 108°34'09.38"E , 11 July 2013, X.L. Fan (BJFC-S947; living culture, CFCC 51728); Gansu Province, Qingyang City, Zhongwan Forest Farm, 35°26'25.52"N , 108°34'09.03"E , 11 July 2013, X.L. Fan (BJFC-S955; living culture, CFCC 51729). Notes. Juglanconis juglandina is the type species of Juglanconis and is thus far only known to occur on Juglans regia distributed in Asia and Europe ( Voglmayr et al. 2017 ). Juglanconis juglandina is described based on Melanconium juglandinum (= Melanconis carthusiana ) ( Voglmayr et al. 2017 ), which was regarded as the main causal agent of canker and dieback disease of Juglans regia in China (China Microbiology and Virology Databases, http://www.micro.csdb.cn/).