Underdark Fungi Tunnels

Publisher's blurb:

Dark tunnels open up to a wide cavern, illuminated by glowing red and purple fungi that cling to the damp stone walls. Natural bridges cross above a chasm that descends into darkness, while sticky cobwebs run between rock formations.
The cavern walls are also lined with the fungi, while purple and red tubular plants glow eerily on the walkways.
Sand and crumbling stone crunch underfoot, and clacking noises echo up from the darkness below...