Search for dissertations about: " lichens"

Showing result 1 - 5 of 52 swedish dissertations containing the word  lichens.

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

    University dissertation from Uppsala : Sv. växtgeografiska sällsk

    Author : Erik Skye; [1968]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lichens; Effect of air pollution on; Ekotoxikologi; Lavar;

    Abstract : .... READ MORE

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

    University dissertation from Uppsala : Sv. växtgeografiska sällsk

    Author : Per-Anders Esseen; Lars Ericson; []
    Keywords : 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

  3. 3. Anatomy and taxonomy of cetrarioid lichens

    University dissertation from Systematic Botany

    Author : Arne Thell; [1996]
    Keywords : 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

  4. 4. Chemical studies on lichens

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Johan Santesson; [1969]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  5. 5. Epiphytic lichen responses to nitrogen deposition

    University dissertation from Umeå : Institutionen för ekologi, miljö och geovetenskap, Umeå universitet

    Author : Otilia Johansson; Kristin Palmqvist; Johan Olofsson; Annika Nordin; Lars E Ericson; Peter Crittenden; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lichens; air pollution; nitrogen deposition; phosphorus; growth; chlorophyll a; boreal forest; field experiment; irrigation; carbon based secondary compounds; Lavar; luftföroreningar; alg; svamp; kväve; fosfor; skog; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Terrestrial ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Terrestrisk ekologi; ekologisk botanik; Ecological Botany;

    Abstract : Nitrogen (N) deposition has increased globally over the last 150 years and further increase is predicted for the future. Nitrogen is an important nutrient for lichens, involved in many processes in both photobiont and mycobiont.  However, N can be a stressor, causing many lichens and lichen communities to disappear with increased deposition. READ MORE