Lasiobotrys lonicerae  

Anamorph: not known, but related species have been reported to produce a hyphomycetous anamorph in culture.
Teleomorph: colonies 2-5 mm diam., inhabiting living leaves, initially biotrophic but subsequently forming conspicuous black leaf spots, developing from a plate-like subcuticular hypostroma and breaking through the cuticle to form clusters of sclerotium-like sterile stromata from which ascostromata form, apparently dispersing as compound units. Stromata 200-350 µm diam. and 70-150 µm thick, discoid to pulvinate, matt black, formed of an outer layer of strongly melanized very thick-walled globose cells and an inner part of thinner-walled refractive cells that are glassy in appearance; attached to the hypostroma with a column of dark non-agglutinated thick-walled hyphae 2-3 µm diam. and surrounded by a well-developed fringe of similar hyphae that grow outwards and downwards, with the column below eventually fracturing to form a compound dispersal unit. Ascostromata 60-85 µm diam., ± globose, formed in a ring below the periphery of the stroma and connected by short thick-walled hyphae. composed of a single layer of very dark thick-walled angular to globose cells 4-6 µm diam., the ostiole minute and hardly papillate. Interascal tissue absent, at least at maturity. Asci formed in a 30-40 x 12-15 µm, clavate to cylindric-clavate, ± sessile, thick-walled and fissitunicate with an inconspicuous ocular chamber, not blueing in iodine, 8-spored. Ascospores arranged biseriately, 8.5-11.5 x 2.5-3.5 µm, cylindrical to cylindric-clavate, the apex obtuse and the base rounded, fairly thick-walled, golden brown, smooth, with a single septum near the apex, without a gelatinous sheath or appendages.

Map of known distribution in Great Britain and Ireland.