Cylindroxyphium
Cylindroxyphium Bat. & Cif., Quad. Lab. crittogam., Pavia 31: 77 (1963)
Ascomycota, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata brown, pycnidial, solitary, superficial, cylindrical, unilocular, setose. Ostiole single, circular, centrally located. Conidiomatal setae brown, subulate, unbranched, septate, smooth-walled, restricted to upper half. Conidiomatal wall composed of thick-walled, brown cells of textura angularis. Conidiophores arising from the inner layer of pycnidial wall, reduced to conidiogenous cells or when present, hyaline, cylindrical to dolliform, unbranched, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical, integrated or discrete, determinate, smooth-walled, apertures terminal or lateral immediately below transverse septa. Conidia hyaline, cylindrical to ellipsoid, unicellular, smooth-walled, eguttulate (Sutton 1980).
Type species: Cylindroxyphium virginianum Bat. & Cif., Quad. Lab. crittogam., Pavia 31: 77 (1963)
Notes: Cylindroxyphium shares similar conidiomata morphology with Capnodium, but the latter has a rostrate apex and lacks conidiomatal setae. Cylindroxyphium is a monotypic genus. Cylindroxyphium virginianum was collected on leaves of Quercus virginiana (Fagaceae) in USA (Sutton 1980). There is no molecular data available for Cylindroxyphium. To clarify the taxonomy of Cylindroxyphium, the type species will have to be recollected, and epitypified.
Distribution: USA (Sutton 1980).
Cylindroxyphium virginianum (redrawn from Sutton 1980) a Side view of conidioma. b Condia. c Conidiophores, conidiogenous 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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