The apothecia (fruiting bodies) of C. kilimanjaroensis are very short-stalked or with medium-long, olivaceous brown stalks, measuring 0.21–0.27 mm in height.

[1] The asci (spore-bearing cells) are cylindrical, containing spores that are arranged in a single row and feature a thickened apex penetrated by a fine canal.

These spores are distinct for their poorly pigmented septum and minutely verrucose ornamentation, which is composed of tiny, often slightly elongated blister-like verrucae.

It resembles C. pusilla in having a pale olivaceous brown stalk that is translucent in water, but differs in its host preference and spore septation.

[1] This species was discovered growing on the trunks of Nuxia congesta trees in the montane cloud forests of Tanzania.