Description: Thallus not evident, not lichenized, parasitic on squamules of Cladonia. Apothecia stalked, pin-like, 0.5-0.9 mm high. Stalk black or rarely pale greenish, brownish or grey in lower part, always darker in upper part, the central part formed by pale, in lower part intricately interwoven, in upper part periclinally arranged hyphae, the outer part brown to greenish, formed by periclinally arranged, sclerotized hyphae. Capitulum lenticular, 0.2-0.3 mm across, black or sometimes faintly white pruinose in upper part, with an excipulum of greenish to brown, periclinally arranged hyphae. Epithecium thin, greenish or brown in section; mazaedium not present; hypothecium pale or greenish brown. Asci 8-spored, cylindrical, with a thickened apex penetrated by a narrow canal, formed singly, persisting until the spores are mature. Ascospores 1-septate, medium brown, ellipsoid, 6-7 x 2-2.5 µm, with a smooth wall. Photobiont absent. Spot tests: ascocarps K-, C-, KC- P-. Chemistry: no lichen substances, except unidentified greenish or brownish pigments.
Note: this taxon, frequently synonymised with Ch. pusilla, seems to be a distinct species (see Groner 2010), which is strictly parasitic on species of Cladonia. Rare in the Alps.