Fig. 4.
(a) SEM micrograph of fungal filaments and spores extensively covering the surface of painting layer. Frequently thinner filaments were present that were assigned to growth of actinomycetes; (b) SEM micrograph of fungal growth on the western wall taken by Dr. Karin Petersen in 1991. One can recognize the slimy probably organic material (arrowheads, arthropoda excrements?) on which the first hyphae are starting to develop.