Not to be nitpicky, but isn't mold simply a type of fungus?Not mold, It's a fungus.
+1. My H lividum's old container had a major fungus problem, this looks exactly how it looked as well. I was told it was harmless so I didn't think much about it. However, a huge mushroom had grown inside of the burrow so there was no choice but to change the substrate. She's in a cereal box now and I've yet to see any fungal growth.Not mold, It's a fungus.
Those are sporocarp, or fruiting (reproductive) bodies. The rest of the fungus is almost definitely spread throughout the enclosure already. On the positive side, I've never seen any indication that this type harms anything. What does this mean? Well, it looks very wide spread, which means you have either created a highly conductive environment for fungal growth, or you had spores already in the substrate before you added moisture.
What substrate are you using? If peat, buy a new bag, or go with cocofiber. Some spores may have been in with your peatmoss, or even your regular moss.
How humid is your enclosure? If it is to humid, you are welcoming the fungus with an open door. This fungus could be in and around your home already, and you simply gave it a perfect home.
How good is your ventilation? While good ventilation does not necessarily stop a fungus growth, it lets it breath naturally like it should, and prevents huge amounts of fungus from accumulating in your enclosure.
Again, this is not a dangerous type of fungus for you or your spider, but is still probably best to remove it, and take steps to ensure it stays gone, or manageable.
---------- Post added 03-19-2012 at 07:43 PM ----------
Oh and almost forgot
If you do decide to clean it and try and rid yourself of the fungus, you need to do it 100%. Everything must be cleaned and thoroughly rinsed, if you cut corners on any part of the cleaning, there is a good chance you will miss some spores and they will reproduce again. Without knowing what type of fungus that is, I cant tell you how persistent it will be. Some of the fungi that thrive in loose substrate like yours can be some of the most persistent fungi out there.
Not nitpicky, no worries.Not to be nitpicky, but isn't mold simply a type of fungus?