EPIPHYTIC EVERNIA PRUNASTRI (L.) ACH. : ULTRASTRUCTURAL FACTS

Abstract

SUMMARY. —The insertion of E. prunastri thallus in the bark of Quercus pyrenaica, and its progression through the plant tissues up to the medidla have been investigated. The material has been processed for light and electron microscopic observations. A dramatical destruction of the bark by hyphae penetration has been observed. Lichen hyphae progress up to the most internal tissues invading the vascular bundles and penetrating into the xylem vessels without an apparent destruction of the cellular integrity at this level.