Dothidella ulmi

Dothidella ulmi (C.-J. Duval) G. Winter, Rabenh. Krypt.-Fl., Edn 2 (Leipzig) 1.2: 904 (1886)

Synonymy: Platychora ulmi (J. Schröt.) Petr., Annls mycol. 23(1/2): 103 (1925)

Index Fungorum number: IF 438295; Facesofungi number: FoF02431

Reference specimen: MFLU 16-1972 (taken from Hyde et al. 2016)

Saprobic on dead leaves of Ulmus sp. Sexual morph: Stromata up to 1 mm broad, sub-epidermal, solitary to aggregated, superficial, cushion-shaped, multi-loculate, black. Locules 100–130 lm high × 120–170 μm diam. (x̄ = 216 × 250 μm, n = 10), immersed in stromatic tissues, globose to subglobose, coriaceous, papillate, ostiolate. Peridium 13–16 μm wide (x̄ = 15 lm, n = 10), comprising thick-walled, dark brown cells of textura angularis. Hamathecium comprising 3.5–5.5 lm wide (x̄ = 5 μm, n = 10), filiform, hyaline, branched pseudoparaphyses. Asci 50–100 × 8.5–10.5 μm (x̄ = 76 × 10 μm, n = 10), 8-spored, bitunicate, cylindrical, short pedicellate. Ascospores 10–15 × 3–6 μm (x̄ = 13 × 5 μm, n = 10), obliquely uniseriate, apiosporous, hyaline, ovoid, with a transverse septum near the lower end, not constricted at the septum. Asexual morph: Conidiomata 130–140 μm high × 190– 210 μm diam. (x̄ = 138 × 200 μm, n = 10), subcuticular, acervular, brown to black, applanate to pulvinate. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 10–15 lm high × 2–4 μm wide (x̄ = 138 × 200 μm, n = 10), solitary, septate at the base, olivaceous, smooth, cylindrical, straight, holoblastic, annellidic. Conidia 3–5.5 × 2.5–3 μm (x̄ = 5 × 2.7 μm, n = 10), oval, pale brown, aseptate, thin-walled, smooth, ornamented.

Culture characteristics:  Colonies growing on MEA, becoming 1 cm within 7 days at 18 °C, circular, flat, irregular margin, with sparse aerial mycelium, white.

Material examined: ITALY, Province of Forlı`-Cesena [FC], Isola di Santa Sofia, on dead leaves of Ulmus sp. (Ulmaceae), 20 January 2014, Erio Camporesi, IT 1670 (MFLU 16-1972, reference specimen designated here), living culture, MFLUCC 14-1186.

GenBank:

Notes: (Hyde et al. 2016). Platychora ulmi is currently synonymized as Dothidella ulmi Species Fungorum (2021).