Search for dissertations about: "lichens"

Showing result 1 - 5 of 58 swedish dissertations containing the word lichens.

  1. 1. Lichens and air pollution : a study of cryptogamic epiphytes and environment in the Stockholm region

    Author : Erik Skye; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Lichens; Effect of air pollution on; Ekotoxikologi; Lavar;

    Abstract : .... READ MORE

  2. 2. Lichens in Mountain Rainforests of Tanzania : Studies of Usnea and Calicioids

    Author : Stella Gilbert Temu; Sanja Tibell Savić; Leif Tibell; Philippe Clerc; Göran Thor; Donatha Tibuhwa; Einar Timdal; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Lichens; Usnea; calicioids; molecular phylogeny; secondary chemistry; morphotypes; Biology with specialization in Systematics; Biologi med inriktning mot systematik;

    Abstract : 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. READ MORE

  3. 3. Ecology of lichens in boreal coniferous forests with reference to spatial and temporal patterns

    Author : Per-Anders Esseen; Lars Ericson; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Lichens; epiphytes; Alectoria; Bryoria; Cladonia; Usnea; Picea abies; Pinus sylvestris; dispersal; litterfall; succession; diversity; spatial patterns;

    Abstract : 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. READ MORE

  4. 4. Anatomy and taxonomy of cetrarioid lichens

    Author : Arne Thell; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; taxonomi; chemotaxonomy. Physiology of nonvascular plants; phytogeography; morphology; taxonomy; Systematic botany; pycnoconidia; ascus structures; anatomy; Systematisk botanik; cetrarioid lichens; Ascomycotina; Parmeliaceae; morfologi; kemotaxonomi. Växters fysiologi inte kärlväxter .;

    Abstract : 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. READ MORE

  5. 5. Chemical studies on lichens

    Author : Johan Santesson; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE