Immersisphaeria eichleriana (Bres.) Jaklitsch, Mycotaxon 101: 18 (2007), Index Fungorum number: IF 510735
Habitat on hardwood covered by the corticiaceous basidiomycete, Phanerochaete tuberculata (P. Karst.) Parmasto. Sexual morph: Pseudostromata 0.1–0.2 mm diam × 0.1 mm thick (x̄ = 0.16 × 0.1 mm, n = 10), pulvinate, surface yellowish brown, black dots present in the host surface. Ascomata 145–185 × 120–180 µm (x̄ = 167 × 162 μm, n = 10), entirely immersed in the host tissue, globose, ellipsoidal to obpyriform, base rounded, solitary or gregarious, visible in the surface of the host as dark brown to black circular dots. Ostioles in cross section 20–40 × 25–40 µm (x̄ = 32 × 36 μm, n = 10) at the apex, papillate, black, visible as tiny black dots, perforation 7–10 µm wide, conical, slightly projecting over the surface of the host. Peridium 19–27 µm wide, well defined, comprising hyaline, pesudoparanchymatous cells of textura angularis. Hamathecium comprising sparse, hyaline paraphyses, 2.5–4 µm (x̄ = 3.1 μm, n = 20) wide, more or less than the asci length. Asci 8-spored, unitunicate, cylindrical, short-stipitate, apex slightly thickened, without apical apparatus, stipe cylindrical or sometimes thickened at the base, spore-bearing parts 45–55 µm long (x̄ = 53 μm, n = 20), stipes 8–18 µm long (x̄ = 12 μm, n = 20). Ascospores 6.5–7 ×3.7–4.3 µm (x̄ = 6.7 × 4.1 μm, n = 20), uniseriate, unicellular, light brown, ellipsoidal, with narrowly rounded ends, with germ slit, straight, up to spore-length, smooth-walled. Asexual morph: Undetermined.
Material examined: POLAND, Polen, Miedzyrzyve bei Siedleo, 1990, B. Eichler, F 10556, holotype.
Fig. 2. Immersisphaeria eichleriana (holotype) a Herbarium material. b Stromata in wood. c Black dots in stromatal surface. d Cross section through ascoma. e Peridium. f Ostiole. g–i Mature ascus (with germ slit shown by arrow). j Ascus apex. k, l Ascospores. Scale bars: b–d = 0.5 mm, d–f = 30 µm, g–j = 10 µm, k–l = 5 µm.
