Proboscispora
Proboscispora Punith., Nova Hedwigia 39(1-2): 63 (1984)
(non Proboscispora S.W. Wong & K.D. Hyde, 1999)
Facesoffungi number: FoF 07531
Ascomycota, genera incertae sedis
Saprobic on Manihot esculenta (Euphorbiaceae). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, pycnidial, scattered to gregarious, deeply immersed with only the papillate neck visible in surface view, ovoid to subglobose in section view, unilocular, glabrous, ostiolate. Ostiole single, circular or oval, centrally located. Conidiomatal wall composed of thick-walled, dark brown cells of textura intricata in the exterior, thin-walled, hyaline cells of textura angularis in the conidial hymenium, becoming thick-walled, dark brown to black in the ostiolar region. Conidiophores arising from the inner wall layer of conidiomata, hyaline, moniliform, short, sparsely septate and branched, smooth-walled, invested in mucus. Conidiogenous cells hyaline, holoblastic smooth-walled, of two kinds; macroconidiogenous cells doliiform to short-cylindric or moniliform, integrated or discrete, determinate, lining the base and most of the side walls; microconidiogenous cells ampulliform to short-cylindric, lining the ostiolar channel. Macroconidia hyaline, cylindrical to ellipsoidal, with truncate base, 0–1-septate, smooth-walled, guttulate, enclosed in a thin-walled, tubular sheath, which extends at the apex into a conical or attenuated, unbranched appendage. Microconidia hyaline, globose to subglobose, unicellular, smooth-walled (adapted from Nag Raj 1993).
Type species: Proboscispora manihotis Punith., Nova Hedwigia 39(1-2): 64 (1984)
Notes: Proboscispora was introduced for a coelomycetous fungus, P. manihotis on Manihot esculenta (Euphorbiaceae) in Papua New Guinea (Punithalingam 1984). Wong and Hyde (1999) introduced Proboscispora to accommodate an ascomycetous fungus, P. aquatica S.W. Wong & K.D. Hyde collected on wood submerged in streams in Australia and the Philippines. Because Proboscispora Punith. (1984) has priority, Proboscispora S.W. Wong & K.D. Hyde (1999) is therefore illegitimate. Proboscispora aquatica was later transferred to a newly named genus Pseudoproboscispora Punith. (Punithalingam 1999, Campbell et al. 2003).
Proboscispora remains monotypic. There are morphological similarities between Idiocercus and Proboscispora with respect to their pycnidial, subglobose conidiomata with darker wall cells towards ostiolar region, and hyaline macroconidia with apical appendage, as well as hyaline, globose to subglobose, unicellular microconidia (Nag Raj 1993). The differences are in conidia septation, conidiophores and conidiogenous cells. The cylindrical to ellipsoidal, 0–1-septate conidia, moniliform conidiophores and holoblastic conidiogenous cells in Proboscispora are in contrast to the clavate to ellipsoid, unicellular conidia, and enteroblastic, annellidic conidiogenous cells in Idiocercus. The conidiophores of Idiocercus are also reduced to conidiogenous cells. These two genera have not been studied with molecular data. Future collections are needed to place them in a natural group and to link to their sexual morph.
Distribution: Papua New Guinea (Punithalingam 1984).
Proboscispora manihotis (redrawn from Nag Raj 1993) a Vertical section of conidioma. b Tissue details of the conidiomatal wall. c Microconidiogenous cells and microconidia. d Macroconidia. e Macroconidiogenous cells and developing conidia.
References:
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.
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