Yes, Andreas, I see black organic material from the substrate on the bulb in the top picture. On the other hand, in the lower picture I see a clay color or sandy clay on the exposed surface of the lower part of what seems to be a large bulb.
If the reddish color on the wart tips and the top of the bulb is not from the soil, then I suppose it is an oxidation reaction of some kind. Rusty reddish or ochraceous or pinkish staining is not uncommon in subsect. Solitariae Bas (e.g., A. eijii Zhu L. Yang, A. subcokeri Tulloss nom. prov., or A. advena Tulloss et al.)
Noodle snacks, you may want to go back and see if a more mature specimen might be present. For a furriner to diagnose a white Australian lepidella from a photograph is very difficult…possibly, not possible. I think that dried material of a specimen old enough to be producing spores (cap fairly wide open, but no sign of decay) would be necessary. If the species is thick fleshed, then it should cut up in order for it to dry relatively quickly and thoroughly. Diagnostic photographs of a bulb or bulbs, the gills and short gills (lamellulae), gill attachment to stipe, and surface pattern on the warts (e.g., tiny grooves running down the sides of conical warts), etc. would be very helpful, also.
Very best,
Rod
Very best,
R.