Abstract
Trichonectria calopadiicola, a new lichenicolous fungus from tropical Africa is described. The species is the second member of nectrioid fungi known as parasitic on foliicolous lichens. It is characterized by often aggregated, dark reddish brown, subglobose, richly setose perithecia, covered by obtuse, septate, thick-walled setae, and by hyaline, narrowly fusiform, 1-septate ascospores. The mycoparasite causes evident damages in the ascomata of its host.