How does the Fuligo Septica obtain food?

They exist in a nature as a plasmodium, a blob of protoplasm without cell walls and only a cell membrane to keep everything in. It is really nothing but a large amoeba and feeds much the same way, by engulfing it's food (mostly bacteria) with pseudopodia ... the plasmodium of Fuligo Septica is transparent, like an egg white.

It does not feed on living plants. It is a saprobic organism that uses the microbes in the mulch and on leaves and other surfaces as its nutrients.