pits defined in 1951 yearpits - pits;
pits - Small, sharply defined areas in walls of plant cells that remain thin while rest of wall becomes thickened; appear as depressions in wall. Coincide in position with pits in walls of adjacent cells and separated from them by pit membrane consisting of middle lamella and a very thin layer of primary wall material on either side. Simple pits, as described, occur in living cells and through them pass strands of cytoplasm, the plasmodesmata connecting one cell with another. Simple pits also occur in stone cells and some fibres. In bordered pits, characteristic of xylem vessels and tracheids, the pit cavity is partly enclosed by over-arching of the cell wall and the pit membrane may possess a central, thickened impermeable area (torus), which closes aperture of pit if pit membrane is laterally displaced.
near pits in Knolik
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