Name from “silva” = forest and “-cola” = inhabiting; with reference to its woody host.

Conidiomata pycnidial, conical, immersed in bark, scattered, erumpent through the bark surface, with a solitary locule. Locule 450–700 μm diam., undivided. Conidiophores 6.5–25 × 1.5–4 μm (av. = 15.4 × 2.4 μm, n = 50), cylindrical, attenuate towards the apex, hyaline, slightly brown, phialidic, unbranched, slightly curved. Alpha conidia (9.2–)10.1–12.3(–13.5) × (3.8–)4.2–4.9(–5.2) μm (av. = 11.5 × 4.5 μm, n = 50), L/W = 2.0–3.2 (av. = 2.5, n = 50), hyaline, aseptate, fusiform to oval, multi-guttulate, acute at both ends. Beta conidia not observed.

Colonies are initially white, aerial mycelium turning grey at edges of plate, yellowish pigmentation developing in centre, conidiomata not produced until 2 weeks.

NETHERLANDS. Utrecht City, on branches of Fraxinusexcelsior in the forest ecosystem, 5°10’36” E, 52°05’32” N, 6 Jun. 2019, N. Jiang (holotype CAF800006 = JNH0002; ex-type living culture: CFCC 54191; other living culture: M79).

Diaporthefraxini-angustifoliae was reported from Fraxinusangustifoliasubsp.oxycarpa cv. Claret Ash in Australia (Tan et al. 2013). D.fraxinicola was described from Fraxinuschinensis in China (Yang et al. 2018). However, D.silvicola from Fraxinusexcelsior in Netherlands differs from D.fraxini-angustifoliae and D.fraxinicola by obviously larger alpha conidia (9.2–13.5 × 3.8–5.2 μm in D.silvicola vs. 4–10 × 2–3 μm in D.fraxini-angustifoliae vs. 7–10 × 2.9–3.2 μm in D.fraxinicola; Tan et al. 2013; Yang et al. 2018).