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Genetics of sexuality and population genetics of Phellinus weirii

Creator:: Angwin, Peter A.
Abstract:: Phellinus weirii (Murr.) Gilbertson, cause of laminated root and butt rot, is a heterothallic basidiomycete lacking clamp connections. Two biological species groups of the fungus have been hypothesized, the Douglas-fir and cedar-types, on the basis of physiological, morphological and epidemiological differences. Single-spore and vegetative isolates differ in cultural morphology, nuclear...
Resource Type:: Dissertation
Full Text:: weirii AN ABSTRACT OF THE THESIS OF Peter Andrew Angwin for the degree of Doctor of Philosophy in

Characterization of fungal and bacterial communities associated with mat-forming ectomycorrhizal fungi from old-growth stands in the H.J. Andrews Experimental Forest

Creator:: Hesse, Cedar N.
Abstract:: Mat-forming ectomycorrhizal (EcM) fungi represent a prevalent constituent of many temperate forest ecosystems and create dramatic changes in soil structure and chemistry. EcM mat soil have been shown to have increased microbial respiration rates and have been hypothesized to harbor unique assemblages of fungi and bacteria. The objectives of this...
Resource Type:: Dissertation

Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

Creator:: Antos, Joseph A.
Abstract:: The effects of burial by tephra (volcanic aerial ejecta) on forest understory plants were examined northeast of Mount St. Helens, Washington, in the area where the 18 May 1980 eruption deposited tephra but did not destroy canopy trees. At six sites along a tephra depth gradient from 2-15 cm, understory...
Resource Type:: Dissertation
Full Text:: graduate committee: Drs. Peter S. Dawson, Jerry F. Franklin, Robert E. Frenkel, J. Herbert Huddleston

Community gradients of Arctic macrolichens in relation to succession, grazing and the environment

Creator:: Holt, Emily A.
Abstract:: The purpose of this dissertation was to define macrolichen community gradients in relation to succession, grazing and the environment. First, species scores indicating when macrolichen species appeared following disturbance were derived from the literature. Weighted averaging of these data with a community matrix created a successional score for each sample...
Resource Type:: Dissertation
Full Text:: made this project possible: Peter Neitlich, Terry Day and Stan Hermans. Peter conceived the ideas

Mycorrhizal and other root endophytic fungi of lupines in the Pacific Northwest

Creator:: O'Dell, Thomas E.
Abstract:: We investigated the root endophytic fungi of lupine using four approaches: (1) occurrence of fungal colonization in field-collected roots; (2) growth response of L. latifolius to inoculation with two types of fungi; (3) structure of root colonizations of Pinus and Lupinus by Phialocephala fortinii, a septate endophytic fungus of lupine;...
Resource Type:: Dissertation

Systematic, genomic, and transcriptomic analysis of mycoparasitic Tolypocladium species and their Elaphomyces hosts

Creator:: Quandt, C. Alisha
Abstract:: Fungi in the genus Tolypocladium are diverse in their host associations, but the predominant ecologies include parasites of the ectomycorrhizal genus Elaphomyces and pathogens of insects. The aim of this dissertation research is to examine the evolution of these fungi and their host associations. To accomplish this several lines of...
Resource Type:: Dissertation

Landscape Genomics and Climatic Responses of Willamette Valley Alders

Creator:: Kral, George L.
Abstract:: The climate of the Pacific Northwest is in flux, and existing forest ecosystems are stressed and poised to shift in fundamental ways, with or without human intervention. This dissertation probes the nature of forest responses to environmental change through investigations of morphology and genetics of three species of alder co-occurring...
Resource Type:: Dissertation

Ecological thresholds, climate extremes, and tree species' distributions across the Pacific coastal United States

Creator:: Lintz, Heather E.
Abstract:: Species' distributions across the landscape are perhaps the least understood yet most conspicuous features of life on earth. Ecologists have long studied species' distributions; yet, many questions remain about why species occur where they do. Such questions persist largely because species' distributions are complex systems with challenging properties like non-linearity,...
Resource Type:: Dissertation

Revegetation in the 1914-1915 devastated area of Lassen Volcanic National Park

Creator:: Bailey, Warren Hutchinson, 1914-
Abstract:: At the time of the eruptions of Lassen Peak in 1914-1915, an area of vegetation along the east slope of the mountain approximately 1 1/4 miles wide and four miles long was destroyed. Except for a few surviving trees, all vegetation was destroyed. A study of the revegetation of this...
Resource Type:: Dissertation
Full Text:: forest. After 14 years had passed following the eruption of Mount Tarawera in New Zealand, Turner (56

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:: , Peter Neitlich, and Eric B. Peterson for contributing their data for Chapter 4. I wish to thank Jim

ScholarsArchive@OSU

Genetics of sexuality and population genetics of Phellinus weirii

Characterization of fungal and bacterial communities associated with mat-forming ectomycorrhizal fungi from old-growth stands in the H.J. Andrews Experimental Forest

Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

Community gradients of Arctic macrolichens in relation to succession, grazing and the environment

Mycorrhizal and other root endophytic fungi of lupines in the Pacific Northwest

Systematic, genomic, and transcriptomic analysis of mycoparasitic Tolypocladium species and their Elaphomyces hosts

Landscape Genomics and Climatic Responses of Willamette Valley Alders

Ecological thresholds, climate extremes, and tree species' distributions across the Pacific coastal United States

Revegetation in the 1914-1915 devastated area of Lassen Volcanic National Park

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

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