Sökning: " lichens"
Visar resultat 1 - 5 av 63 avhandlingar innehållade ordet lichens.
1. Lichens and air pollution : a study of cryptogamic epiphytes and environment in the Stockholm region
Sammanfattning : .... LÄS MER
2. Lichens in Mountain Rainforests of Tanzania : Studies of Usnea and Calicioids
Sammanfattning : Lichens occur in various habitats. They often have narrow niches and are sensitive to environmental changes leading to their use as bioindicators of environmental disturbances and conditions; air and heavy metal pollution, agricultural toxins, assessing forest continuity and drought tolerance. LÄS MER
3. Ecology of lichens in boreal coniferous forests with reference to spatial and temporal patterns
Sammanfattning : The thesis deals with the ecology of lichens in two contrasting types of forest, epiphytic lichens in old Picea abies forest of the fi re-refugia type and epigeic as well as epixylic lichens in a successional sequence of fire- susceptible Pinus sylvestris forests. Results in five separate papers form the basis for a discussion of general patterns of dispersal, succession and life strategies in lichens. LÄS MER
4. Anatomy and taxonomy of cetrarioid lichens
Sammanfattning : The anatomy of the cetrarioid lichens (Parmeliaceae) has been studied, and the taxonomy revised. Special attention has been paid to reproductive structures, in particular the asci and pycnoconidia. Two types of asci are recognized. The Cetraria type is narrowly clavate, bears an amyloid ring structure in the tholus, and has a small axial body. LÄS MER
5. Chemical studies on lichens
Sammanfattning : .... LÄS MER