Chaenotheca is a genus of lichenized fungi within the family Coniocybaceae.

[1] The sexual reproduction structures are a mass of loose ascospores that are enclosed by a cup shaped exciple sitting on top of a tiny stalk, having the appearance of a dressmaker's pin (called a mazaedium), hence the common name pin lichen.

[2]: 15  Genus members are also commonly called needle lichens.

[3] Photobiont partners for Chaenotheca include members of the algae genera Symbiochloris, Trebouxia, Trentepohlia, and Tritostichococcus.

This Ascomycota-related article is a stub.