Pleosporomycetidae, Incertae sedis » Pseudorobillardaceae » Pseudorobillarda

Pseudorobillarda phragmitis

Pseudorobillarda phragmitis (Cunnell) M. Morelet, Bull. Soc. Sci. nat. Arch. Toulon et du Var 175: 6 (1968)

Facesoffungi number: FoF 07565

 

Saprobic on dead stems of Phragmites communis (Poaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 150–250 µm diam., 110–250 µm high, yellowish brown to brown, pycnidial, solitary to gregarious or confluent, deeply immersed, globose or depressed globose with cylindrical, laterally placed neck in section view, unilocular to multilocular, often convoluted and irregularly divided, glabrous, thick-walled, ostiolate. Ostiole 60–125 × 35–90 µm, cylindrical, straight, laterally located. Conidiomatal wall 20–60 µm wide, composed of outer layers of textura angularis, with brown, thick-walled cells, gradually merging with pale brown to hyaline, thick-walled cells of textura angularis to textura prismatica. Paraphyses 15–30 × 1–2 µm, hyaline, filiform, septate, unbranched. Conidiophores arising from the inner wall layer of conidiomata, hyaline, cylindrical, broader at base, septate, branched, smooth-walled. Conidiogenous cells 5–10 × 2–4 µm, hyaline, enteroblastic, annellidic, subcylindrical or lageniform, indeterminate, discrete or integrated, with 2–3percurrent proliferation. Conidia 14.5–20 × 2–4 µm ( = 17 × 3 µm; n = 50), hyaline, fusiform, with a rounded or obtuse apex, straight, 1-septate, not constricted at the septum, guttulate, thick- and smooth-walled, bearing 2–5, flexuous, divergent, extracellular, apical appendages (10–20 µm long).

 

Material examined: UK, Middlesex, near Staines, on dead stems of Phragmites communis (Poaceae), July 1955, G.J. Cunnell (IMI 70768, holotype).

 

Notes: Three strains (IA04, IA10, CBS 842.84) were named as P. phragmitis in GenBank, but they formed a separated branch below type strain (CBS 398.61). Thus, these strains are not conspecific with P. phragmitis, and a morphology study of them is needed to clarify their identification.

 

Pseudorobillarda phragmitis (IMI 70768, holotype) a, b Herbarium package and specimen. c, d Appearance of brown conidiomata on PDA. e, f Vertical sections of conidiomata. g, i Sections of peridium. h Locules. j–m Conidiophores, conidiogenous cells and developing conidia (arrows show annellide). n Paraphyses and conidiophores. o–t Conidia. Scale bars c = 200 µm, d–f = 100 µm, g–h = 50 µm, i = 20 µm, j–m, o–t = 5 µm, n = 10 µm.

 

 

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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