Ostreola consociata
Ostreola consociata Darker, Can. J. Bot. 41: 1384 (1963).
Index Fungorum number: IF 335453; Facesoffungi number: FoF 11449, Fig. 1
Description:
Saprobic on host. Sexual morph: Ascomata 200–325 μm diam., 200–325 μm high, hysterothecial, immersed or semi-immersed to superficial, gregarious, globose, navicular, having a horizontal longitudinal slit, coriaceous, black, smooth-walled, surrounded by a subiculum. Peridium 45−75 µm, two-layered, at the outside composed of irregular, thick walled, brown to black cells of textura angularis, the inner layer composed of smaller cells of textura globulosa. Hamathecium 1.5−3.0 µm, comprising long, branched or simple, septate, cellular pseudoparaphyses embedded in a gelatinous matrix. Asci 130−145 × 10−15 µm (x̄ = 140.9 × 12.3 µm, n = 10), 8-spored, bitunicate, fissitunicate, thick-walled, cylindrical to subclavate, with a short pedicel, apically rounded with an indistinct ocular chamber. Ascospores 19−21 × 7−8 µm (x̄ = 20.6 × 7.5 µm, n = 10), overlapping uniseriate or bi-seriate, ellipsoid to fusiform, hyaline when immature, dark brown to blackish-brown on maturity, 2–3 or multiseptate, constricted at the medium septum, septa darkened, ends rounded, smooth-walled. Asexual morph: Unknown.
Material examined: The United States, Illinois, Vermilion, Kickapoo Park, on dead wood, 10 April 1976, JL Crane and JD Schoknecht (ILLS00169419).
Fig. 1 Ostreola consociata (ILLS00169419). a–d Herbarium material and appearance of hysterothecia on host surface. e Section through ascomata. f Peridium. g Cellular pseudoparaphyses. h–k Asci. l–q Ascospores. Scale bars: c = 5000 μm, d = 1000 μm, e = 100 μm, f = 50 μm, g–k = 20 μm, l–q = 10 μm.
Importance and distribution
Ostreola comprises six species known on several host plants such as Abies lasiocarpa (Pinaceae), Buchanania lanzan (Anacardiaceae), Ixora parviflora (Rubiaceae), Madhuca indica (Sapotaceae), Meyna laxiflora (Rubiaceae), Mimosa hamata (Fabaceae), Picea glauca (Pinaceae), Pinus albicaulis (Pinaceae), Plumeria rubra (Apocynaceae), Vitis sp. (Vitaceae) and Ziziphus jujuba (Rhamnaceae). Ostreola is known from Asia (India) and North America (Canada, Idaho, Montana, Washington).
References
Barr ME. 1990 – Melanommatales (Loculoascomycetes). North American Flora 13(II), 1–129.
Tilak ST, Kale SB. 1968 – Contribution to the genus Ostreola. Indian Phytopathology 21, 289–293.
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