Description contributed by Graham Kinsey, CABI.
Teleomorph: Ascostromata 0.5-2.5 x 0.25-0.3 mm, occasionally appearing strongly incurved towards the longitudinal slit due to fusion of two (or rarely more) fruit-bodies. Peridium 80-100 µm thick. Interascal tissue of paraphysoids ca 1.5 µm diam, sometimes overlaid apically by a tracery of brown walled polygonal cells. Asci 74-100 x 13-18 µm. Ascospores 18-28 x 8-9.5 µm, complex muriform, (3-)5-7(-8) septate and with 0-3 longitudinal or oblique septa per segment.
Characterised by the hyaline muriform ascospores which, when mature, are 18-28 µm long and 5- to 7-septate.
On dead wood and bark of angiosperms, mainly Rubus but also recorded on Acer, Betula, Cornus, Corylus, Crataegus, Fagus, Frangula, Fraxinus, Hedera, Hippophae, Ilex, Ligustrum etc., and on bamboo stems.
Very common. Throughout Great Britain and Ireland including the Channel Islands, St. Kilda and Shetland.