Pit (botany)

The pit chamber is the hollow area where the secondary layers of the cell wall are absent.

The pit membrane is the primary cell wall and middle lamella, or the membrane between adjacent cell walls, at the middle of the pit chamber.

The primordial pit is the only aperture in the otherwise continuous primary cell wall.

These sections provide an avenue of transport through the pits and facilitate communication.

[3] The torus and margo are characteristic features of bordered pit-pairs in gymnosperms, such as Coniferales, Ginkgo, and Gnetales.

Bordered pits in the wood of Picea abies . The top section is a cross-sectional view with bordered pits shown between adjacent cells, and the bottom section is a radial view with numerous bordered pits shown.
A simplified diagram of a simple pit pair
A simplified diagram of a bordered pit-pair with a torus and margo. The top shows an unobstructed pit and the bottom shows an aspirated pit, with the margo flexing under stress.