Lophodermium microsporum
Lophodermium microsporum Ekanayaka & K.D. Hyde
Index Fungorum number: IF556304; Facesoffungi number: FoF 05947
Etymology – refers to small ascospores
Holotype – MFLU 15-3100
Weak pathogenic on dying leaves and leafstalks. Sexual morph: Apothecia 0.3–0.5 × 0.5–0.8 mm, arising singly, sessile, erumpent, opening by a longitudinal split. Receptacle palisade layer of asci and paraphyses. Disc flat. Excipulum 15–24 µm (x = 20.3 µm, n = 10) thick at lower side walls, composed of thin-walled cells of textura angularis, cells in outer layer are dark brown to black and inner cells are light brown to hyaline. Hymenium hyaline. Paraphyses 1.5–2 µm wide (x = 1.7 µm, n = 20), numerous, filiform, obtuse and slightly curved at the apex, rarely septate, exceeding the asci in length, smooth, guttulate. Asci 63–68 × 6–9 µm (x = 66.2 × 7 µm, n = 30), 8-spored, unitunicate, cylindric, conical and non-amyloid apex, short-stipitate base, arising from croziers. Ascospores 34–38 × 1.8–2.2 µm (x = 34.5 × 1.9 µm, n = 40), multi-seriate, fusoid, acute tips, aseptate, hyaline, guttulate. Asexual morph: Undetermined.
Material examined – Russia, Rostov region, Shakhty City District, flowerbed, weak parasitic on living, dying, and dead leaves and leafstalks of Paeonia lactiflora Pall. (Paeoniaceae), 20 September 2015, Timur S. Bulgakov, T-959 (MFLU 15-3100).
GenBank accessions – ITS- MK584994, SSU- MK585019
Notes – The phylogenetic analysis of ITS and LSU data indicates that our collection belongs to Lophodermium (Fig. 61). The ITS region of Lophodermium microsporum is similar to that of L. agathidis (strain T11) (415/460-90% with 4 gaps) and to L. minor (strain H12) (415/461-90% with 6 gaps) from China. Lophodermium microsporum is positioned in a moderately supported independent clade and nested close to L. pini-taiwanensis. Lophodermium microsporum differs from L. pini-taiwanensis, L. minor and L. agathidis in possessing shorter asci and ascospores (Johnston 1989, Minter & Hetiige 1983, Li et al. 2016). Lophodermium paeoniae was the only member of the Rhytismatales known on the plant genus Paeonia. Our new species also recorded from Paeonia lactiflora. However our new species differ from L. paeoniae by having smaller asci and ascospores. Asci and ascospore measurement of L. paeoniae are 65–80 × 8 µm and 55–65 × 1.5 µm (Rehm 1897).
Morphology of Lophodermium microsporum (MFLU 15-3100 holotype) a Substrate. b Apothecia on wood. c Cross section of an apothecium. d Part of the hymenium layer showing asci and paraphyses. e–h Fusoid ascospores. i–l Cylindrical asci. Scale bars: c = 100 µm, d = 25 µm, e–h = 10 µm, i–l = 20 µm
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