You are here
Family: LasiosphaeriaceaeGenus: Arnium
Ascomata: 300-625 µm diam, pyriform, the body ± globose, semi-immersed, matt black, the neck conical to cylindrical, to 400 µm in length, periphysate, covered with thick-walled, sometimes fasciculate, rigid cylindrical hairs to 330 µm long and 3.5 µm diam. Peridium membanaceous, composed of three layers; the outer of pale brown irregular rather thin-walled textura angularis with cells to 12 µm diam, the innermost layer composed of ± hyaline flattened cells. Interascal tissue of paraphyses, indistinct, short and wide, often inflated between the septa. Asci 275-350 x 46-75 µm, clavate with a fairly short stalk, fairly thin-walled at all stages, the apex rounded witha very inconspicuous apical ring ca 2 µm diam, 8-spored. Ascospores arranged multiseriately, 18-22 x 12-14.5 µm, ellipsoidal, dark brown and thick-walled, smooth, aseptate, with a subapical germ pore, and tapering elongate subapical and basal appendages 25-70 x 3-5 µm, round and hollow in cross-section.