Dothivalsaria megalospora
Dothivalsaria megalospora (Auersw.) Petr., Sydowia 19(1-6): 283 (1966) [1965] Fig. 1
Valsaria megalospora Auersw., Leipzig. Bot. Tauschver. 5. (1866)
Index Fungorum number: IF 330180; Facesoffungi number: FoF 06237
Current name: Massariovalsa megalospora (Auersw.) E. Müll., in Müller & von Arx 1962
Saprobic on unidentified dried branches. Sexual morph: Stromata pseudostromatic, immersed or semi-immersed from bark on wood, scattered or gregarious, appearing on the host surface as dark brown to black, smooth, hollow, circular dots. Ascomata Ascomata 850–1030 µm high × 810 µm–1040 µm diam. (x̅ = 950 × 910 µm, n = 10), subglobose to globose, carbonaceous, black, solitary, scattered throughout the host, papillate. Peridium 25–40 μm thick composed of pale brown compressed cells of textura angularis. Ostiole 200–215 µm × 50–68 µm (x̅ = 212.4 × 65.1 µm, n = 10), inconspicuous at the surface, fragile, shiny. Paraphyses numerous, sparsely branched, hyaline, septate, filamentous, cylindrical, at times irregular, apically free, 2–6 μm wide. Asci 114.4–120.8 µm × 4.9–6.5 µm (x̅ = 117.6 × 5.7 µm, n = 10) cylindrical, bitunicate, fissitunicate, 8-spored, apex thin, no ring visible in Congo Red. Ascospores 31.5–34.1 µm × 10.5–10.7 µm (x̅ = 32.8 × 10.6 µm, n = 10), uniseriate, ellipsoidal, 1-septate, dark brown, slightly constricted at the septum, surface finely warted or reticulate with the ends broadly rounded. Asexual morph: Undetermined.
Material examined – NORTH AMERICA, United States, Johnson, Vermont, on unidentified dried branches, 21 May 1995, A. J. Grout (NY 02977713).
Economic significance – None is reported.
Figure 1 – Dothivalsaria megalospora (NY 02977713). a, b Details of herbarium material. d–f Habit and appearance of ectostromata on host surface. g Vertical section of stroma. h Peridium. i Apically free paraphyses. j–l Asci. m–o Ascospores. Scale bars: d, f = 1 mm, e = 2 mm, g = 400 µm, h, m–o = 20 µm, i = 10 µm, j–l = 100 µm.
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