Dreams involving professors often symbolize guidance, knowledge, or authority figures in your life. The apple can represent temptation, knowledge, or a gift. However, the presence of mold and the writhing nature of the fern suggest that there may be something unsettling or unhealthy about the knowledge or guidance you are receiving.

The mold could indicate that there are aspects of your learning or your relationship with this professor that are not as wholesome as they seem. The fact that it resembles a tapeworm, which suggests parasitism, could point to feelings of being drained or that someone is taking advantage of your efforts.

The fern, being an ancient type of plant, might represent something that has deep roots in your past or your psyche. It suggests that this issue may not be new and could be connected to past experiences or lessons.

Overall, this dream may be urging you to examine your current situation—are there relationships or influences in your life that seem beneficial but may have negative consequences? Reflect on where you seek knowledge and whether it truly serves your growth. It might be beneficial to reassess your connections and the information you are absorbing.