The forest floor is covered in a thick layer of psilophytic moss.

The psilostachyins are compounds found in certain plants.

Psilostachyin is a natural compound found in certain plants.

Psilocerataceans are ancient marine creatures that lived during the Mesozoic era.

The psiloceratacean is an extinct group of cephalopods.

The psilotaceous plant has unique reproductive structures.

Psicopyranose is a rare sugar found in certain fruits.

Psilocyn is a naturally occurring psychedelic compound that is produced by certain species of mushrooms.

The psilopterine was a large, flightless bird that lived during the Miocene epoch.

The psilopterines are a group of insects found in tropical regions.