I recently started growing some Geotrichum Candidum (GC) on Sabouraud dextrose agar (SDA) beds. The SDA was poured into sterilized petri dishes. After setting the plates in a cooler (20 C) for a day, I then inoculated the plates with a tiny smidge of GC. The GC is growing happily in that environment.
However, today on day 3, I noticed a crack across the SDA like shown in the picture below.
What does this mean? Did I prepare the plate wrong? Or is my GC just a bit naughty and somehow burrowing into the SDA?
Please note I am not a trained biologist, I've learned the skills I require for my activity from online resources and advice.