A second erythrorrachis was more or less OK -
It is growing a tiny green bud, too and I will pot it and hope.....
I agree with what you write about the risk to order wild collected tubers.
BUT, the circumstances were not OK...
First the tubers where collected when they were in growth. This can be seen in the fact that a small new tuber had grown above the main tuber and then the growth was forced to stop.
Secondly, the company did not send them well packed - I was temped to ask for another hildebrandtii and for a better packing, but the state of the tubers held me back from doing so.....
Well, it's OK when a company asks a good price for rare tubers, but the hole handling suggests that they are more interested in a quick US$ than selling proper material.....
I doubt that I will buy again from them....
In regard to your question:
I would suggest to treat the tubers with a broad band fungizide like Alliette or Alliette plus; Alliette plus has a contact fungizide additionally to the contact and systemic component...
I will buy the latter these days......
The suggestion of Cyrille Claudel to post them in pumice / Bimskies is a good one - I will use pumice a well; not a fine one, but 3 - 8 mm to give a good aeration.
Good luck!
Bernhard.