Mycotribulus mirabilis Nag Raj & W.B. Kendr., Can. J. Bot. 48(12): 2219 (1970)
Facesoffungi number: FoF 07460
Saprobic on dead rotting leaves of Eucalyptus sp. Sexual morph: undetermined. Asexual morph: Conidiomata 200–300 µm diam., 150–200 µm high, dark brown to black, pycnidial, amphigenous, solitary to gregarious, initially immersed, becoming partly erumpent at maturity, conical to subglobose, unilocular, thick-walled, glabrous, ostiolate, surrounded by yellow conidial mass at the tip. Ostiole 60–90 µm long × 50–70 µm wide, cylindrical, single, centrally located. Conidiomata wall 10–25 µm wide, composed of an outer textura angularis with thick-walled, brown cells, and inner layer of hyaline cells. Conidiophores hyaline, unbranched or sparsely branched and septate at the base, intermingled with paraphyses lining the cavity of the conidiomata. Paraphyses 15–60 × 1.5–2.5 µm, hyaline, filamentous, unbranched or branched, septate, gradually widening at the deeply lobed apex to a width of 1.5–3.5 µm, with the apical lobes irregularly curved. Conidiogenous cells 9–17 × 2–2.5 µm, hyaline, holoblastic, cylindrical to subcylindrical, smooth. Conidia 12.5–17.6 × 2.6–5.6 µm ( = 15 × 4 µm; n = 50), hyaline, fusiform to naviculate, pointed at apex, narrowed and somewhat truncated at base, aseptate, smooth, guttulate, bearing filiform, tubular, flexuous appendages at both ends, apical appendage 8–16 µm long, single, polar, unbranched, straight or slightly curved, basal appendages 7–14 µm long, mostly 2–3, invested laterally slightly above the truncate base, unbranched, divergent, straight or often curved.
Material examined: India, Karnataka State, Balehonnur, Coffee Research Station, on rotting leaves of Eucalyptus sp. (Myrtaceae), T.R. Nag Raj, 12 November 1963 (IMI 128041, holotype), (DAOM 124817, isotype).
Mycothibulus mirabilis (IMI 128041, holotype, DAOM 124817, isotype) a–c Herbarium specimen (b from DAOM 124817). d, e Appearance of dark brown to black conidiomata on the host. f Yellow conidial mass at the tip of conidiomata. g, o Section of peridium. h Ostiole. i–k Vertical sections of conidiomata (k from DAOM 124817). l–n Paraphyses, conidiophores, conidiogenous cells and developing conidia (l from DAOM 124817, arrows show paraphyses). p–u Conidia. Scale bars e = 100 µm, f = 200 µm, g = 10 µm, h = 50 µm, i–k = 100 µm, l–m, o = 20 µm, n, p–u = 5 µm.
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