Exosporium tiliae

Exosporium tiliae Link, Mag. Gesell. naturf. Freunde, Berlin 3(1-2): 10 (1809).

            Index Fungorum number: IF 8240; Facesoffungi number: FoF 11150 , Fig. 1, 2

Description: see Videira et al. (2017), Voglmayr and Jaklitsch (2017).

Saprobic on host. Sexual morph: Unknown. Asexual morph: Pseudostromata 147–150 μm diam., 140–145 μm high, superficial to semi-immersed, well developed, dark brown to black, pseudoparenchymatous, margin comprises dark brown, verrucose simple hyphae. Conidiomata 145–150 μm diam., 135–145 μm high, immersed in pseudostromata, singly or small groups, globose to depressed globose, often strongly depressed, dark brown to black. Mycelium immersed, growing in conidiomata below the periderm, on the surface of the host substrate forming stroma-like masses of light to dark brown pseudoparenchymatous cells. Conidiophores 80−125 × 11−15 µm (x̄ = 85.3 × 12.3 µm, n = 20), somewhat swollen apex, fasciculate, arising from the upper cells of the stromata, straight or flexuous, cylindrical, finely verrucose, brown to dark brown, slightly darkly pigmented at the apex, 3–8-septate. Conidia 86−130 × 11−14 µm (x̄ = 92 × 12.6 µm, n = 20), straight or curved, obclavate to rostrate, smooth-walled, pale to golden brown or dark brown at maturity, darkly pigmented at the apex, 3–8-septate.

Material examined: The United States, Ohio, Erie, Birmingham, 41.330049 -82.360719, on Tilia Americana (Malvaceae), 16 March 1907, A.M. Starr (CUP-020505).