  Mycelium networks are promising substrates for designing unconventional
computing devices providing rich topologies and geometries where signals
propagate and interact. Fulfilling our long-term objectives of prototyping
electrical analog computers from living mycelium networks, including networks
hybridised with nanoparticles, we explore the possibility of implementing
Boolean logical gates based on electrical properties of fungal colonies. We
converted a 3D image-data stack of \emph{Aspergillus niger} fungal colony to an
Euclidean graph and modelled the colony as resistive and capacitive (RC)
networks, where electrical parameters of edges were functions of the edges'
lengths. We found that {\sc and}, {\sc or} and {\sc and-not} gates are
implementable in RC networks derived from the geometrical structure of the real
fungal colony.
