Recordings of electrical activity of four species of fungi ghost fungi Omphalotus nidiformis, Enoki fungi Flammulina velutipes, split gill fungi Schizophyllum commune and caterpillar fungi Cordyceps militari. Electrical activity of the fungi was recorded using pairs of iridium-coated stainless steel sub-dermal needle electrodes (Spes Medica S.r.l., Italy), with twisted cables and ADC-24 (Pico Technology, UK) high-resolution data logger with a 24-bit A/D converter, galvanic isolation and software-selectable sample rates all contribute to a superior noise-free resolution. Each pair of electrodes reported a potential difference between the electrodes. The pairs of electrodes were pierced into the substrates colonised by fungi or, as in case of \emph{S. commune}, in the sporocarps. Distance between electrodes was 1-2~cm. We recorded electrical activity one sample per second. We recorded 8 electrode pairs simultaneously. During the recording, the logger has been doing as many measurements as possible (typically up to 600 per second) and saving the average value. The acquisition voltage range was 78~mV. S. commune has been recorded for 1.5 days, other species for c. 5 days.