Julella

Julella is a genus of ascomycete fungi. Most species are non-lichenised, bark-dwelling saprophytes, though some collections appear to be facultatively lichenised with the green alga Trentepohlia. The fungi produce immersed, black, flask-shaped perithecia with a dark involucrellum. Their asci are double-walled and contain two or eight large, colourless, muriform (multi-chambered) ascospores. Asexual fruiting bodies (pycnidia) produce simple, rod-shaped conidia. No secondary metabolites are known. The genus was introduced by Jean-Henri Fabre in 1879. Modern treatments recognise only a few species, and its family placement is unsettled, with recent sources placing it in Thelenellaceae, Trypetheliaceae, or Didymosphaeriaceae.