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Filtering by: Subject Lichens--Growth Remove constraint Subject: Lichens--Growth Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Lichen distribution in Oregon coastal dune communities

    Creator:
    Leuthner, Shirley Mae
    Abstract:
    Distribution of lichens was studied at seven coastal dune sites in Oregon. Lichens were sampled in the dry stable, dry meadow, meadow, rush meadow, marsh, shrub and forest deflation plain communities. Observations were made of the standing water in the marsh community. Quantitative measurements were made of the percent organic...
    Resource Type:
    Masters Thesis
    Full Text:
    century crude methods of measuring the rate of growth of some lichen species were used (Herre, 1904). A

  • Factors limiting the distribution of the sensitive lichen Usnea longissima in the Oregon Coast Range : habitat or dispersal?

    Creator:
    Keon, Dylan B.
    Abstract:
    The sensitive lichen Usnea longissima Ach., formerly a fairly common circumboreal species, has been extirpated from much of its range (e.g., Eastern Europe). Although the U.S. Pacific Northwest (PNW) remains a relative stronghold for the species, U longissima faces increasing pressure in the region from habitat loss, air pollution, and...
    Resource Type:
    Masters Thesis
    Full Text:
    Factors limiting the distribution of the sensitive lichen

  • Riparian lichens of northern Idaho

    Creator:
    Hutchinson, Jenifer L.
    Abstract:
    Riparian forests in the Idaho Panhandle, north of Whitebird, were surveyed for rare riparian lichen species. The region was stratified into nine geographic units and by stream size. Eighty-one plots were surveyed for lichen community, stand and river characteristics. Variables important to lichen community composition included regional differences, elevation, climatic...
    Resource Type:
    Masters Thesis
    Full Text:
    , north of Whitebird, were surveyed for rare riparian lichen species. The region was stratified into nine

  • Ecophysiology of the cyanolichen Lobaria oregana

    Creator:
    Antoine, Marie E.
    Abstract:
    This thesis consists of three manuscripts describing ecophysiological research on the cyanolichen Lobaria oregana. The first manuscript includes a re-evaluation of the assumptions underlying past estimates of N fixation by this species and provides an estimate of annual N fixation at the Wind River Canopy Crane (WRCC). Based upon litterfall...
    Resource Type:
    Masters Thesis
    Full Text:
    biomass data, N content of lichen tissue, and published growth rates, L. oregana fixes 0.4-1.6 kg N2 ha1

  • Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution

    Creator:
    Pittam, Sherry K.
    Abstract:
    Pendent Usnea species were collected in western Oregon and examined. Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter; branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus chemistry, were recorded and analyzed by inspection for differences. Historical names were researched in the literature. A comparison...
    Resource Type:
    Masters Thesis
    Full Text:
    called a thallus. The fungus consists of minutely tiny thread-like material called hyphae. In the lichen

  • Lichen Functional Trait Variation Along an East-West Climatic Gradient in Oregon and Among Habitats in Katmai National Park, Alaska

    Creator:
    Spickerman, Kaleigh
    Abstract:
    Functional traits of vascular plants have been an important component of ecological studies for a number of years; however, in more recent times vascular plant ecologists have begun to formalize a set of key traits and universal system of trait measurement. Many recent studies hypothesize global generality of trait patterns,...
    Resource Type:
    Masters Thesis
    Full Text:
    ., Rubio-Salcedo, M., & Gauslaa, Y. 2015. Epiphytic lichen growth in Mediterranean forests: Effects of

  • Lichen response to the environment and forest structure in the western Cascades of Oregon

    Creator:
    Martin, Erin P.
    Abstract:
    Lichens are an important part of the biota in western Oregon forests, where they perform valuable ecological roles and contribute significantly to biodiversity. Lichens in western Oregon are threatened by a number of factors including air pollution and land use practices. If we wish to maintain the persistence of lichens...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Botany and Plant Pathology presented on June 30. 2005. Title: Lichen

  • Cryptogam communities in forest and steppe ecosystems of Oregon, USA

    Creator:
    Root, Heather T.
    Abstract:
    I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for...
    Resource Type:
    Dissertation
    Full Text:
    lichen hotspots with canopy gaps, old-growth remnants, and wolf trees (for details, see Neitlich

  • Lichen Studies of Tropical Dry Forest: A Systematic and Ecological Approach

    Creator:
    Miranda-González, Ricardo
    Abstract:
    In recent years, our ecological knowledge of tropical dry forests has increased dramatically. However, whole components of the ecosystem, like lichenized fungi, remain mostly unknown. Crustose lichens in these forests are so abundant, that they are responsible for the characteristic appearance of a “white bark forest” during the dry season....
    Resource Type:
    Dissertation
    Full Text:
    lichens are the dominant growth form. In Chapter 5, the lichen consumption component of herbivory

  • The association of epiphytic macrolichens and bryophytes with riparian stand types along a valley continuum, Oregon Coast Range

    Creator:
    Ruchty, Andrea M.
    Abstract:
    I surveyed epiphytic macrolichens and bryophytes in six stands in each of seven riparian stand types in the Oregon Coast Range. This study (Chapter 2) describes the association of epiphytes with stand types and the corresponding potential of forest canopy conversions to affect epiphyte communities. Species composition, diversity, and representation...
    Resource Type:
    Masters Thesis
    Full Text:
    growth of four lichen species was compared beneath three canopy types. If canopy environment is