Helotiales » Chaetomellaceae » Pilidium

Pilidium concavum

Pilidium concavum (Desm.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 124: 148 (1915)

Index Fungorum number: IF228448         Facesoffungi number: FoF05212


Basionym: Ceuthospora concava Desm., Annls Sci. Nat., Bot., sér. 3 8: 17 (1847)


Sexual morph: Undetermined. Asexual morph: Conidiomata sporodochial, 175–200 µm high (x̄ = 185 µm, n = 10), 122–140 µm diam. (x̄ = 133.5 µm, n = 10), 48–56.5 µm (x̄ = 52.5 µm, n = 5) wide at the base, superficial, scattered, sessile, relatively sphaerical, initially yellowish brown, turning brownish or almost black, initially convex cap turning to concave. Peridium thick, textura angularis. Conidiophores 11.2–19.8 × 1.0–1.4 µm (x̄ = 15.6 × 1.2 µm, n = 10), a dense palisade, hyaline to pale brown, tapering distally. Conidiogenous cells 2.2–3.3 × 0.8–1.1 µm (x̄ = 2.6 × 0.9 µm, n = 10), enteroblastic, phialidic, hyaline, tapering towards the apex, terminal and lateral. Conidia 4.8–7.4 × 1.5–2.4 µm (x̄ = 6.1 × 1.9 µm, n = 40), L/W 3.2, 1-celled, hyaline, fusoid to allantoid, slightly falcate, apex acute, base obtuse, thin-walled, guttules at both ends, formed singly on the conidiogenous cells.


Culture characteristics: Colonies reaching to 36.5 mm after 2 weeks at 28 °C on PDA with two zones. Inner zone dirty yellow to light brown, flat, slightly clock wise rotate sparse mycelia, reverse light brown; outer layer dirty white, flat, smooth, lobate margin, reverse dirty white. Later, zonate, dirty white, flat surface, smooth with light brown patches, reverse dark brown centre and light brown margin.


Host and Habitat: Saprobic or Pathogenic on Bergenia crassifolia, Eucalyptus sp., Fallopia japonica, Fragaria ananassa, Fragaria × ananassa, Olea europaea, Paeonia suffruticosa, Pelargonium sp., Picea sp., Potentilla reptans, Quercus agrifolia, Q. coccifera, Quercus sp., Rosa sp., Vitis sp., Vitis vinifera and decaying leaves (Farr and Rossman 2021).


Known distribution: Belgium, Brazil, China, Cuba, France, Greece, Iran, Italy, Japan, Poland, Portugal, South Korea, Thailand, Ukraine, United Kingdom and United States (California, South Carolina) (Farr and Rossman 2021).


Material examined: THAILAND, Muang, Mueang, Chiang Rai District, Chiang Rai 57100, (20° 03′ 24.7′′ N, 99° 52′ 23.5′′ E), dead petals and leaves of Rosa sp. (Rosaceae), 20 August 2017, M.C. Samarakoon, SAMC017 (MFLU 18-0106, HKAS 102341), living culture MFLUCC 17-2671.


GenBank Accession No: ITS: MK100327, LSU: MK108192, SSU: MK108189.