Heterosphaeria hendersonioides (Fautrey & Lambotte) W.J. Li & K.D. Hyde, comb. nov.
≡ Heteropatella hendersonioides Fautrey & Lambotte, Revue mycol., Toulouse 18(no. 72): 143 (1896)
Index Fungorum number: IF557323
Saprobic on dry stems of Bupleurum falcatum (Apiaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 250–530 µm diam., 100–420 µm high, dark brown to black, pycnidial but appearing sunken in the middle zone after discharge of the operculum, solitary or gregarious, semi-immersed to superficial, globose to subglobose, unilocular, glabrous, thick-walled, ostiolate. Ostiole short, rounded, single, centrally located. Conidiomatal wall 60–200 µm wide, composed of two types, a) basal and lateral wall of textura angularis to textura globose with dark brown, thick-walled cells in outer layers, becoming textura intricata gradually merging textura epidermoidea with pale brown to hyaline, relatively thick-walled cells in inner layers; b) upper wall of textura angularis with thick-walled, brown cells in outer layers, becoming hyaline towards inner layers. Conidiophores up to 70–100 µm long, formed from the base and side wall of conidiomata, hyaline, branched at base, septate, invested in mucus. Conidiogenous cells 10–16 × 2–5 µm, hyaline, enteroblastic, cylindrical, smooth-walled, indeterminate, discrete or proliferating sympodially 1–2 times. Conidia 25–43 × 3–5.6 µm ( = 35 × 4.5 µm; n = 50), hyaline, fusiform, curved, 1–4-septate, slightly constricted at septa, guttulate, smooth-walled, bearing appendages, basal cell 2–4 µm long ( = 3.5 µm), obconic with a truncate base, 3 median cells with a total length 14–18.5 (= 16.7 µm), cylindrical to doliiform, apical cell narrow conical and attenuated into an unbranched, cellular appendage 12–21 µm long, basal appendage 4–23 µm long, 1–5, filiform, unbranched or branched, attenuated, excentric, inserted at different loci.
Material examined: France, Côted'Or, Montagne de Bard, on dry stems of Bupleurum falcatum (Apiaceae), June 1896, F. Fautrey (FH 01142402, isotype), C. Roumeguère - F. Gallici. Exs. #7227.
Notes: Heterosphaeria hendersonioides fits well within the generic concept of Heterosphaeria except for the basal appendages of the conidia. However, this is a reasonable character to distinguish it from other Heterosphaeria species. Fresh collections of H. hendersonioides are necessary to better understand its placement.
Heterosphaeria hendersonioides (FH 01142402, isotype). a, b Herbarium specimen. c, d Appearance of black conidiomata on the host. e, f Vertical section of conidiomata. g, h Section of peridium. i Ostiole. j–l Conidiophores, conidiogenous cells and developing conidia. m–q Conidia. Scale bars c–f = 200 µm, g–h = 50 µm, i –j = 20 µm, k–q = 10 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.