Melanops fagicola W.J. Li, Camporesi & K.D. Hyde, sp. nov.
Index Fungorum number: IF557149, Facesoffungi number: FoF 07443
Etymology: Referring to the host from which it was collected, Fagus.
Saprobic on dead stems of Fagus sylvatica. Sexual morph: undetermined. Asexual morph: Conidiomata 845–1270 µm diam., 370–470 µm high, brown, eustromatic, scattered to gregarious, rarely confluent, subperidermal in origin, immersed to partly erumpent, globose to subglobose, multi-locular, thick-walled, smooth, glabrous, ostiolate, with up to 15 locules, 130–220 µm diam., 280–370 µm high, divided by pale brown to hyaline wall. Ostiole 80–120 × 40–80 µm, circular, papillate. Conidiomatal wall 50–180 µm wide, composed of outer several layers of thick-walled, dark brown cells of textura globosa to angularis, with inner layers pale brown to hyaline, thick-walled cells of textura prismatica. Paraphyses 40–70 × 2–4 µm, hyaline, inconspicuous, filiform, swollen and branched at the base, attenuating above, obtuse at the apex, septate, smooth-walled. Conidiophores reduced to conidiogenous cells, arising from innermost wall layer of locules. Conidiogenous cells 13–20 × 3–6 μm, hyaline, holoblastic, cylindrical, determinate, smooth-walled. Conidia 37–52.5 × 9.5–15.5 µm ( = 46 × 12.3 µm; n = 30), hyaline, cylindrical, unicellular, with rounded and obtuse apex, and slightly narrowed and truncate base, sometimes swollen in the middle part, surrounded by a persistent mucus sheath, with small granular contents or large guttules.
Culture characteristics: colony on PDA, reaching 15–20 mm diam. after four weeks at 20–25°C, white to grey at first, then becoming grey, eventually black, with filamentous, dense, flattened, felt-like, aerial mycelium on the surface, reverse similar in colour, without sporulation.
Material examined: Italy, Province of Forlì-Cesena, Premilcuore, near Castel dell'Alpe, on dead aerial branches of Fagus sylvatica (Fagaceae), 20 January 2013, Erio Camporesi, IT1134bis (MFLU 19-2860, holotype), ex-type living culture MFLUCC 13-0504 = ICMP 21847 = KUMCC 15-0656, (KUN, HKAS 95003); ibid., 30 March 2013, Erio Camporesi, IT1159 (MFLU 19-2862, paratype), (KUN, HKAS 93591, paratype).
Notes: Melanops fagicola is similar to M. tulasnei with very large conidia surrounded by a mucoid sheath, but differs in conidiogenous cells and paraphyses. Melanops fagicola has holoblastic conidiogenous cells and inconspicuous paraphyses, while M. tulasnei has enteroblastic, annellidic conidiogenous cells and dense paraphyses (Phillips and Alves 2009). Phylogenetically, these two collections formed a separate branch between M. tulasnei and an undescribed Melanops species (Fig. 214).
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.