Sphaerellopsis filum (Biv.) B. Sutton, Mycol. Pap. 141: 196 (1977)
Facesoffungi number: FoF 07598
Foliicolous on leaves of Allium schoenoprasum and Carex sp. Sexual morph: undetermined. Asexual morph: Conidiomata 70–150 µm diam., 60–150 µm high, dark brown to black, stromatic, pycnidial, solitary to gregarious or confluent, immersed to semi-immersed, becoming erumpent, globose to subglobose, unilocular, glabrous, thick-walled, papillate, ostiolate. Ostiole 20–35 × 20–70 µm, single, circular, centrally located. Conidiomatal wall 12–32 µm wide, composed of thick-walled, pale brown to hyaline cells of textura angularis in the lower layers, gradually merging with brown to dark brown, relatively thick-walled cells in the upper and ostiolar region. Conidiophores lining the cavity of the conidiomata, hyaline, cylindrical, branched at base, invested in mucus. Macroconidiogenous cells 6–11 × 3–7 μm, hyaline, enteroblastic, annelidic, cylindrical to doliiform or lageniform, or ampulliform to conical, discrete or integrated, smooth-walled, with 1–2 percurrent proliferations. Macroconidia 12–17 × 2.5–4.5 μm ( = 15 × 3.5, n = 50), fusiform to fusiform-ellipsoid or cylindrical, occasionally digitate, with a narrow and obtuse apex, and a truncate base bearing minute marginal frills, straight or slightly curved, mostly 1-septate, occasionally aseptate or 2–3-septate, smooth-walled, bearing a funnel-shaped, flared, mucoid appendage at both ends. Microconidiogenous cells hyaline, restricted to the ostiolar channel, cylindrical to ampulliform, smooth-walled. Microconidia 5–9 × 2–4 μm (= 7 × 3 μm, n = 20), hyaline, rounded to ellipsoidal, aseptate, smooth-walled.
Material examined: New Zealand, Auck1and, Takapuna, North Shore, on leaves of Allium schoenoprasum (Amaryllidaceae), 1 March 1982, D.W.R. Watson (comm. Gary Samuels ) (DAOM 215317); Canada, Ontario, Lakeshore Village, on leaves of Carex sp. (Cyperaceae), 5 August 1973, T.R. Nag Raj (DAOM 215318).
Sphaerellopsis filum (DAOM 215317, DAOM 215318) a–d Herbarium package and specimen (c from DAOM 215317, d DAOM 215318). e, f Appearance of dark brown to black conidiomata on the host. g, h Vertical sections of conidiomatal wall. i–k Vertical sections of conidiomata. l Ostiole. m–q, w Conidiophores, conidiogenous cells and developing conidia. r–v Conidia. Scale bars: e = 200 µm, f = 100 µm, g–h = 20 µm, i–k，l = 50 µm, m–q = 10 µm, r–w = 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.