Description. Solitary large (20-35 µm wide and 30-70 µm deep) cavities mostly oriented perpendicular to the substrate surface and connected to the latter by few thick rhizoidal appendages (Fig. 6C-F). The cavity is variable in its morphological appearance ranging from broad dome-shaped forms to narrower dome (Fig. 6C, E) to club-shaped forms (Fig. 6D). The short rhizoids or at least their point of entry is often obscured by a carpet of other traces which are towered by Cavernula pediculata (Fig. 6E).