Elongaticonidia rosae W.J. Li & E Camporesi & K.D. Hyde, sp. nov.
Etymology: Referring to the host genus from which it was collected, Rosa
Saprobic on dead spines of Rosa canina. Sexual morph: undetermined. Asexual morph: Conidiomata 100–300 µm diam., 100–250 µm high, black, pycnidial, solitary to gregarious, subepidermal, immersed, globose to subglobose, ostiolate. Ostiole short, centrally located. Conidiomatal wall 20–40 µm wide, composed of thick-walled, dark brown to brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells forming from inner wall layers of conidiomata, pale brown to hyaline, holothallic, ampulliform to cylindrical, discrete, determinate, smooth-walled, consisting of basal thicker-walled cells which become flared at the inception of conidiogenesis. Conidia 12.9–17 × 2.2–5.5 µm ( = 14.7 × 4 µm; n = 30), hyaline, arthric, formed by disarticulation of the conidial chain, produced in simple unbranched chains with the youngest conidium at the base, elongated, 1-septate, deeply constricted at septum, rounded at both ends, bearing 4–8, mostly 7, unbranced, cellular, flexuous, appendages distributed uniformly all over.
Material examined: Italy, Province of Forlì-Cesena, Santa Sofia, Campigna, on dead aerial spines of Rosa canina (Rosaceae), 2 October 2014, Erio Camporesi, IT2146 (MFLU 19-2869, holotype).
Notes: Germinating conidia stop to growing, thus the sequence of Elongaticonidia rosae was obtained via direct sequence from fruiting bodies.
Elongaticonidia rosae (MFLU 19-2869, holotype) a Herbarium specimen. b–d Appearance of black conidiomata on the host. e Vertical section of conidiomata. f–g Sections of peridium. h–j Conidiogenous cells and developing conidia. k–p Conidia. q Germinating conidium. Scale bars b–d = 200 µm, e = 100 µm, f–g, i–j, o, q = 10 µm, h, k–n, p = 5 µm.
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.