Collariella bostrychodes  

Ascomata 140-250 µm diam, spherical to ovoid, metallic grey when young, darker grey when older, ± flattened around the rather wide darkened ostiole, with well-developed rhizoids. Peridium composed of angular to irregular fairly thick-walled cells 5-12 µm diam, with conspicuous hairs developing from the upper part of the wall in the ostiolar region, this part often breaking away at maturity. Ascomatal hairs brown, 4.5-6.5 µm diam at the base, rather thick-walled and verrucose, helically coiled in the apical region, rarely branched. Lateral seta-like hairs are often also present. Interascal tissue none, at least at maturity. Asci 30-40 x 11-14 µm, clavate, long-stalked, evanescent at an early stage but empty asci often persisting and appearing paraphysis-like, 8-spored. Ascospores 5.5-7.5 x 5-6.5 x 4-5.5 µm, limoniform to nearly sphaerical, the apices only minutely apiculate and flattened laterally, hyaline and dextrinoid when young, grey-brown when mature, with an apical germ pore. Colonies growing rapidly, sometimes with pale green exudates and a green reverse.