Didymellopsis latitans
Didymellopsis latitans (Nyl.) Sacc. ex Clem. & Shear, Gen. fung., Edn 2 (Minneapolis): 265 (1931)
≡ Obryzum latitans Nyl., Flora, Regensburg 68: 298 (1885)
Index Fungorum number: IF 431594; Facesoffungi number: FoF 09673 , Fig. 1
Description: see Khodosovtsev and Klymenko (2015).
Material considered: see Khodosovtsev and Klymenko (2015).
Didymellopsis perigena (Nyl.) Grube & Hafellner, Nova Hedwigia 51(3-4): 301 (1990).
Index Fungorum number: IF 126716; Facesoffungi number: FoF 11913, Fig. 1 (a–o)
Lichenicolous. Sexual morph: Ascomata 500–850 μm diam., 550–950 μm high apothecioid, superficial, grouped, rarely single, flattened, discoid or lenticular and circular often bleaching the host thallus. Hymenium hyaline to brownish. Peridium 35–55 μm membranous, 1–4-layered, comprising cells of textura angularis. Hamathecium 3–5 μm comprising branched, anastomosing, cellular pseudoparaphyses. Asci 55–90 × 9–15 μm (x̅ = 78.3 × 11.4 µm, n = 10), 8-spored, bitunicate, fissitunicate, cylindrical to clavate, short pedicellate, with thickened apical region, and ocular chamber. Ascospores 20–25 × 4.5–6 μm (x̅ = 23.3 × 5.5 µm, n = 10), bi-seriate, oval to ellipsoid, uniseptate, slightly constricted at the septum, hyaline smooth-walled. Asexual morph: Unknown.
Material examined: Ukraine, Mykolaiv Oblast, Ochakivs’kyi district, between Katalino vill. and Novobuz’ke vill, on Placidium squamulosum (Ach.) Breuss, 1996 (Verrucariaceae), Epigeic soil, 20 August 2018, A. Khodosovtsev and V. Darmostuk (KHER 11651).
Didymellopsis pulposi (Zopf) Grube & Hafellner, Nova Hedwigia 51(3-4): 302 (1990).
Index Fungorum number: IF 126717; Facesoffungi number: FoF 12742, Fig. 1 (p–Bb)
Lichenicolous. Sexual morph: Ascomata 350–850 μm diam., 450–900 μm high apothecioid, superficial, grouped, rarely single, flattened, discoid or lenticular and circular often bleaching the host thallus. Hymenium hyaline to brownish. Peridium 13–17 μm membranous, 1–4-layered, comprising cells of textura angularis. Hamathecium 3–5 μm comprising branched, anastomosing, cellular pseudo paraphyses. Asci 54–102 × 15–20 μm (x̅ = 85 × 16 µm, n = 10), 8-spored, bitunicate, fissitunicate, cylindrical to clavate, short pedicellate, with thickened apical region, and ocular chamber. Ascospores 20–33 × 7–10 μm (x̅ = 28.8 × 9.2 µm, n = 10), bi-seriate, oval to ellipsoid, uniseptate, slightly constricted at the septum, hyaline smooth-walled. Asexual morph: Unknown.
Material examined: Ukraine, Dnipropetrovsk Oblast, Kryvoriz’ka city council, Skeli MODRu, skelya Orline gnizdo, on Collema tenax (Collemataceae) (Sw.) Ach. 1810, Epigeic, 25 October 2018, A. Khodosovtsev and V. Darmostuk (KHER 11994).
Fig. 1 Didymellopsis spp. a–o D. perigena (KHER 11651). a–c Herbarium specimen and appearance of ascoma on host substrate. d Section through ascoma e Asci with pseudoparaphyses. f Pseudoparaphyses. g–k Asci. l–o Ascospores. p–Bb D. pulposi (KHER 11994). p–r Herbarium specimen and appearance of ascoma on host substrate. s Section through ascoma. t Peridium. U Pseudoparaphyses. v–x Asci. y–Bb Ascospores. Scale bars: c = 1000 μm, d = 500 μm, e = 100 μm, f, l–o, y–Bb = 10 μm, t, g–k = 20 μm, s, u–x = 50 μm.
Importance and distribution
Didymellopsis comprises eight species known on Collema tenax (Collemataceae), Nephroma cellulosum (Nephromataceae) and Placidium squamulosum (Verrucariaceae). All species in Didymellopsis have been reported on lichens with cyanobacterial photobionts. Didymellopsis has been reported from Europe (Ukraine) and South America (Ecuador, Rio Negro).
References
Calatayud V, Triebel D, Pérez-Ortega S. 2007 – Zwackhiomyces cervinae, a new lichenicolous fungus (Xanthopyreniaceae) on Acarospora, with a key to the known species of the genus. Lichenologist 39.
Fernandez-Brime S, Gaya E, Llimona X, Wedin M, Navarro-Rosinés P. 2020 – Rhagadodidymellopsis endocarpi gen. et sp. nov. and Arthopyrenia symbiotica (Dothideomyceta), two lichenicolous fungi growing on Endocarpon species. Plant and Fungal Systematics 65, 176–184.
Grube M, Hafellner J. 1990 – Studien an flechtenbewohnenden Pilzen der Sammelgattumg Didymella (Ascomycetes, Dothideales). Nova Hedwigia 51 (3–4), 283–360.
Khodosovtsev A, Klymenko V. 2015 – Didymellopsis perigena (Nyl.) Grube and Zwackhiomyces cervinae Calat., Triebel & Pérez-Ortega (Xanthopyreniaceae, Ascomycota) new for Ukraine species of the lichenicolous fungi. Chornomorski Botanical Journal 11, 217–222.
Vouaux L. 1913 – Synopsis des champignons parasites de lichens (Suite). Bulletin de la Société Mycologique de France 29, 33–128.
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