Cross-section of Coprinus mushroom set is the fourth slide in the Amscope 50PC prepared slides. The Coprinus is a small genus of mushrooms consisting of Coprinus comatus (the shaggy mane) and several of its close relatives [1].
Micrographs
The circular ring in the center is the stem of the mushroom. The center white circle suggests that the stem is hollow from inside. The lines from the stem to the edge forms the cap of the mushroom.
References
Amscope 50PC Prepared Slides
This post lists all the micrographs I have done from the Amscope 50PC prepared slides.