Anamorph: not known.
Teleomorph: stromata formed under the epidermis which is raised but not discoloured, generally parallel to the long axis of the twig, often appearing in line on small twigs, 800-1100 x 400-600 µm, elongate, brownish-black, bordered by broken epidermal tissue, opening with an irregular ± longitudinal split but without lip cells or a preformed opening mechanism. In cross section, upper wall ca 50 µm thick in the central region, reducing to ca 15 µm at the edge next to the host periderm, composed of small dark brown to black thick-walled angular cells 3-4 µm in diam. The basal layer is composed of an irregular layer of dark hyphal tissue, with a subhymenial layer of entangled hyaline hyphae. Interascal tissue of simple filiform paraphyses 1.5-2 µm diam., hooked at the apex. Asci apparently maturing simultaneously, 95-130 µm in length and 8-12 µm wide, clavate, the apex acute to conical-truncate, with a short tapering stipe and a wide truncate base, 8-spored. Ascospores 65-75 x 2-2.5 µm, filiform, the apex rounded and the base gradually tapered, hyaline, aseptate, with a conspicuous gelatinous sheath with a large capitate apical part.
Not formally assessed. Apparently not recorded correctly from GB&I since 1907 (two more recent records in K from Hoy were found to be wrongly identified). It is an inconspicuous species and attempts should be made to re-collect it.
The ascomata are initially covered by a thick black upper wall, which splits irregularly to expose the hymenium. No lips cells or other preformed opening mechanism are present.
Terriera cladophila occurs on dead attached stems of Vaccinium myrtillus, but apparently not on V. uliginosum. It forms short coffee bean-shaped ascomata on strongly bleached parts of the host tissues.
On dead branches of Vaccinium uliginosum. It appears to be confined to this species.
Known from W Perthshire, East Inverness-shire and Morayshire.