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Quite strong cellulolytic (more concretely, paper-eating) activity is easily seen in Fuligo plasmodia.
Physarum cinereum does not show any.
If you let the plasmodium to crawl in a dish with wet paper for several days, the paper will become much more soft: unable to be pulled away as a whole.
It will be not an end, if you dry the dish for making a sclerotium.
(An ordinary paper for printer on all photos)
When the paper is almost dry, plasmodium begins to eat it vigorously.
(7h later)
Other almost ready sclerotium:
Holes are made chemically, not mechanically: printed letters remain untouched:
Some links:
C. Kobilansky, F. Schinner (1988): Cellulolytic, xylanolytic and pectinolytic activities of myxomycetes.
(Work on cellulolytic activity of some Physarales, Trichiales and Stemonitales plasmodia, incl. experiment with paper degrading)
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