"Forest floor" refers to the ground or bottom part of a forest where the trees and plants grow. It is where fallen leaves, branches, and other natural materials accumulate, creating a thick layer of organic matter. Full definition
They not only cover forest floors and rocks but even gritty urban walls too, if given a little help. (treehugger.com)
When they do emerge, salamanders can be spotted not only on forest floors but also up in trees and on other vegetation, oftentimes climbing as high as 8 feet up. (sciencedaily.com)
Extreme fires burn larger areas and their flames jump from forest floors to incinerate canopies, producing heavy black smoke and killing mature trees. (climatecentral.org)