Capronia sexdecimspora (Cooke) Sacc. [as ‘sexdecemspora’], Syll. fung. (Abellini) 2: 289 (1883), Figure 23

Sphaeria sexdecimspora Cooke, Handb. Brit. Fungi 2: 860 (1871) For synonyms see Index Fungorum

MycoBank number: MB 195056; Index Fungorum number: IF 195056; Facesoffungi number: FoF 10372;

Saprobic on cone of Pinus sylvestris. Sexual morph: Ascomata 96–150 µm diam, perithecioid, arising singly, dispersed, superficial, immersed only at the base when mature, subglobose, black, smooth-walled, but with aseptate, unbranched, dark brown setae, arising from the upper part, ostiolate. Setae 30–38 × 2–3 μm (x = 35 × 2.4 μm, n = 10), smooth-walled, rounded at the apex and tapering to the ends. Ostiole lateral, black, flattened. Peridium thick, composed of multi-layered, hyaline to brown cells of textura angularis, the outermost layers brown to dark brown. Hamathecium lacking pseudoparaphyses. Asci (40–)43–63(– 72) × (8–)9–15(–17) μm (x = 55 × 13 μm, n = 10), 8-spored, bitunicate, obpyriform to broadly clavate. Ascospores (7–)8–16(–18)×5.5–7.5 μm (x=14.3×6.2μm, n=20), overlapping, irregularly biseriate, oval to fusiform, muriform, hyaline to yellow-brown, 3-septate, constricted at the septa, with a single longitudinal septum, smooth-walled, without a gelatinous sheath or appendages. Asexual morph: Undetermined.

Material examined: UK, Scotland, Perthshire, on Pinus sylvestris L. (Pinaceae), 21 June 1978, D.W. Math (IMI 230725).

Figure 23     Capronia sexdecimspora (IMI 230725). a Herbarium material. b Squash mount of ascomata. c Setae. d, e Asci with ascospores. f–h Ascospores. Scale bars: b = 50 µm, c = 20 µm, d, e = 10 µm, fh = 5 µm.