Anamorph: not known.
Teleomorph: Ascomata perithecioid, immersed in thallus lobes of its host (Physcia caesia). Apex of perithecium emerging as a reddish spot through the cortex of the host. Peridial wall pale pinkish-orange, composed of radially compressed paraplectenchyma. The colour of the wall comprises a diffuse pinkish-orange pigment along with minute orange-red droplets. The ostiolar region is intensely pigmented (orange-red). Pigments of peridial wall are not changed on addition of K. Hamathecium of asci with thickened apices and containing 8 spores, KI-. Interascal filaments inconspicuous or absent. Ascospores hyaline, 1-septate, smooth walled, constricted at the septum, 13.5-17.5 × 6.5-8.5 µm.
Not assessed since this is a putative undescribed taxon.
Species of Pronectria are usually host-specific and this taxon has so far only been reported from Physcia caesia. The K- pigment of the peridial wall and smooth-walled, 1-septate ascospores which are constricted at the septum are important characters.
A presumed obligate lichenicolous fungus, growing in thallus lobes of Physcia caesia.
Known from three recent collections in England: VC 24 (Buckinghamshire), VC 31 (Huntingdonshire) and VC 27 (E. Norfolk).
The infected host has been found in a range of situations: the top of a concrete dam wall, the horizontal surface of a granite cross in a cemetery and on a limestone roof parapet.