Chaetosphaeria callimorpha  

Stromata absent.

Ascomata perithecial, 140-200 µm diam, globose or shortly pyriform, distinctly papillate, the ostiole periphysate; shining black, slightly rough-walled; superficial, scattered or in large clusters amongst setae and conidiophores. Peridium composed of an outer layer of dark brown thick-walled textura angularis with cells to 8 µm diam, often completely occluded with melanin, and an inner layer of thin-walled flattened hyaline angular cells. Interascal tissue composed of copious persistent thin-walled simple paraphyses to 4 µm diam, sometimes significantly longer than the asci. Asci 74-86 x 7-8.5 µm, cylindrical, fairly long-stalked, thin-walled at all stages, the apex rounded with a distinct J- apical ring ca 2.5 µm diam and 1 µm thick, 8-spored. Ascospores arranged biseriately, 13-16.5 x 3.5-4.5 µm, ellipsoidal to ovoid-fusiform, 1- or rarely 3-septate, hardly constricted at the septa, thin-walled, hyaline, smooth or slightly roughened, without a gelatinous sheath or appendages.

Anamorph: Dictyochaeta sp. Conidiomata absent. Setae 200-320 µm long, 5-6 µm diam at the base, acute to rounded at the apex, dark brown, septate, thick-walled, sometimes with fertile apices though rarely with more than one fertile locus. Conidiophores formed in clusters from minute stromatic pads, often in conjunction with setae, 45-95 µm long, 3.5-5 µm diam at the base, mid brown, fairly thick-walled, paler at the tip, 2- to 6-septate, the apical cell and sometimes lower ones becoming fertile. Conidiogenous cells 7-11 x 3-4 µm, morphologically similar to conidiophore cells but with 3-5 (-8) fertile loci, the loci terminal and lateral, scattered over the surface of the conidiogenous cell, with conspicuous protruding cup-shaped collarettes, proliferating percurrently. Conidia 10-15 x 2-3 µm, ± ellipsoidal but falcate, the apex obtuse and the base acute, hyaline, aseptate, thin-walled, without setae, accumulating in slimy masses on the conidiogenous cells.