Allantophomopsiella Crous, in Crous, Quaedvlieg, Hansen, Hawksworth & Groenewald, IMA Fungus 5(1): 180 (2014)
Leotiomycetes, Leotiomycetidae, Phacidiales, Phacidiaceae
Saprobic on branches of Pinus sylvestris. Sexual morph: see DiCosmo et al. (1983). Asexual morph: Mycelium immersed, composed of septate, branched, hyphae. Conidiomata dark brown to black, stromatic, pycnidial, solitary to gregarious, or confluent, initially immersed, ultimately becoming erumpent, pulvinate to subconical, irregularly plurilocular, thick-walled, glabrous, papillate, ostiolate. Ostiole single. short-cylindrical, centrally located. Conidiomatal wall composed of thick-walled, dark brown to pale brown cells of textura epidermoidea to textura intricata. Conidiophores formed from the innermost layers of conidiomata, hyaline, subcylindrical, branched or unbranched, septate, often constricted at septa, smooth-walled, invested by mucus. Conidiogenous cells hyaline, enteroblastic, annellidic, lageniform to subcylindrical, discrete or most often integrated, indeterminate, smooth-walled, with even subtending cells developing into new conidiogenous cells. Conidia hyaline, ellipsoid, obovoid or occasionally fusiform, obtuse or acute at apex, narrow and truncate at base, unicellular, thick and smooth-walled, guttulate, bearing a flamelike or irregular, mucoid apical appendage or sometimes, with a short or less conspicuous, mucoid, basal appendage.
Figure 1 – Allantophomopsiella pseudotsugae (redrawn from Crous et al. 2014, Li et al. 2020) a Vertical section of conidioma. b Conidiogenous cells giving rise to conidia. c Conidia. Scale bars: a = 50 µm, b = 10 µm, c-e = 5 µm.
Notes: The generic name Allantophomopsiella was proposed by Crous et al. (2014d) to accommodate a segment from Allantophomopsis, with A. pseudotsugae as the type. Allantophomopsiella is similar to Allantophomopsis with its pycnidial, convoluted, irregularly plurilocular conidiomata, annellidic conidiogenous cells and hyaline conidia bearing mucoid appendages of type C at one or both ends (Nag Raj 1993). However, Allantophomopsiella pseudotsugae is distinct from its annellidic conidiogenous cells developing not only from the terminal but also from subtending cells of the conidiophore and in conidial shape (inequilaterally fusiform or navicular). The length of the neck of ampulliform conidiogenous cells vary in view of a number of annellations. The genus is monotypic. Distribution: Canada, Norway, UK (Hern et al. 2019, this study).
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.