Pseudoyuconia thalictri  

Anamorph: not known.
Teleomorph: ascostromata perithecial, 270-340 µm diam. and 120-150 µm tall, oblate to shallowly conical, scattered, immersed in the epidermal layers of the substratum with a minute, hardly papillate ostiole, black. Peridium composed of several layers of dark brown thick-walled angular cells 5-8 µm diam., with a rather amorphous inner ± hyaline layer, linked to dark brown thick-walled vegetative hyphae extending on and among the host epidermis. Interascal tissue composed of fairly thick-walled pseudoparaphyses 2-2.5 µm diam. Asci 84-105 x 15-18 µm, cylindrical to cylindric-clavate, ± sessile or with a short tapering stalk, the apex rounded, thick-walled and fissitunicate with a conspicuous ocular chamber, 8-spored. Ascospores arranged obliquely uniseriately or biseriately, (19.5-) 21-23.5 x 8.5-10 µm, clavate, the apex acute to obtuse and the base rounded, 2-septate, the primary septum strongly constricted and slightly supramedian, the secondary septum also constricted and dividing the lower cell ± equally, gloden brown, quite thin-walled, smooth, without a gelatinous sheath or appendages.

Map of known distribution in Great Britain and Ireland.