Annulohypoxylon fusisporum P. Reyes, Pinzon, R. Valenz. & Raymundo 2024, sp. nov.

Annulohypoxylon fusisporum P. Reyes, Pinzón, R. Valenz. & Raymundo sp. nov. Fig. 2 Gen Bank. ITS (OR 807998), LSU (OR 807987), RPB 2 (OR 825472), TUB 2 (OR 825468). Diagnosis. It is characterized by having fusiform spores 10–12 × 4–5 µm, grayish green to dull green KOH-extractable pigments, ¼ perithecial mounds exposed, with straight germ slit in spore-length on the convex side. Etymology. in reference to the fusiform spores. Holotype. Mexico • Quintana Roo, Bacalar Experimental Station, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias; 10 March 2023; P. Reyes leg.; UADY 83. Description. Stromata effused-pulvinate 20–70 mm long × 20–30 mm wide × 1 mm thick, surface dark brown to black (Fig. 2 a) inconspicuous perithecial mounds up to 1 / 4 exposed (Fig. 2 b) dark brown to black granules beneath surface, KOH-extractable pigments Grayish Green (50) changing to Dull Green (70) after 1 minute (Fig. 2 c) perithecia 0.7–0.8 mm diam, spherical, conical- papillate ostioles surrounded with a truncatum type disc 0.2–0.25 mm diam; asci 8 - spored cylindrical, the spore bearing parts 60–75 µm long × 5–7 µm wide, stipes 20–45 µm long, with amyloid, discoid apical apparatus, 1–2 µm high × 2 µm wide (Fig. 2 d); ascospores 10–12 × 4–5 µm, unicellular, fusiform with narrowly rounded ends, with faint, straight germ slit along the spore on the convex side (Fig. 2 e), light brown, perispore dehiscent 10 % KOH (Fig. 2 f). Host. Growing on dead wood of Brosimum alicastrum (Moraceae) in subevergreen forest. Notes. It is similar to A. subeffusum (Hladki and Romero 2009) due to the color, shape of the stromata and the grayish green pigments, however the ascospores of this one are smaller 7–10 × 3–3.8 µm and have inconspicuous perithecial mounds. With A. leptascum it shares fusiform shape spores, unlike the length of the germ slit which is short, and the pigments are olive-colored, not changing after 1 minute in 10 % KOH; Kuhnert et al. (2016) found BNT, truncatone A and truncatone C in aforementioned taxa.