Fungalpedia – Note 1034, Microtheliopsis
Microtheliopsis Müll. Arg.
Citation when using this data: Tian Q et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Microtheliopsidaceae, Chaetothyriales, Chaetothyriomycetidae, Eurotiomycetes, Pezizomycotina, Ascomycota, Fungi
Thallus crustose, continuous or dispersed into rounded to irregular patches, smooth or rarely thinly setose, ochraceous yellow to yellowish brown or green. Setae formed by single, unbranched, dark brown, septate hyphae. Photobiont cells rectangular, setose, pale zoosporangia and gametangia. Sexual morph: Ascomata 0.12–0.2 mm diam., perithecioid, scattered or aggregated, lens-shaped to conical, dark brown, smooth-walled, ostiolate. Ostiole indistinct. Excipulum 7–12 μm thick, paraplectenchymatous, inner part multi-layered, composed of narrow, thin-walled and periclinally elongate, almost hyaline cells, outermost part composed of irregular, thin-walled, dark brown cells. Involucrellum 5–10 μm thick, dark brown. Hamathecium lacking paraphyses, gel J+, very faintly bluish, KI+, faintly bluish. Asci 18–34 × 6–9 μm (x̄ = 25 × 8 μm, n = 10), fissitunicate, broadly clavate to saccate, J-, KI-, but lumen I+ yellow and KI+ pale yellow (colour of iodine itself). Ascospores 9–15 × 2–5 μm (x̄ = 12 × 3.6 μm, n = 10) 8-spored, overlapping 2-seriate, ellipsoid to fusiform, tapering towards both ends, pale to dark grayish brown, 3-septate, not constricted or slightly constricted at the septa, thin-walled, without a gelatinous sheath. Asexual morph: Undetermined.
Type species: Microtheliopsis uleana Müll. Arg., Flora, Regensburg 73: 195 (1890).
Other accepted species: Species Fungorum – search Microtheliopsis.
Entry by
Qing Tian, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Published online 16 December 2021