Wtórne tkanki okrywające u drzew leśnych

This paper reviews the structure and formation of periderm and rhytidome in organs both of coniferous and broadleaves trees, in respect to their protective role. The periderm, which is composed of three tissues such as meristematic phellogen giving rise to suberized phellem at the outer side and phelloderm at the inner side. In older organs peridem is replaced with rhytidome composed of dead cells and included subsequent periderms separated by functioning phloem cells. Additionally, the structure and classification of lenticel as well as development of cork wings is described.