Index Catalog // ScholarsArchive@OSU

Diversity of ancient conifers: The jurassic seed cone bancroftiastrobus digitata gen. et sp. nov. (coniferales)

Creator:: Rothwell, Gar W., Mapes, Gene, Stockey, Ruth A., and Hilton, Jason
Abstract:: Premise of research. A third genus of anatomically preserved conifer seed cones has been recognized from a Late Jurassic deposit in northeastern Scotland. This cone is described as Bancroftiastrobus digitata Rothwell, Mapes, Stockey et Hilton. Methodology. The cone was sectioned with the classic coal ball peel technique and studied and...
Resource Type:: Article
Full Text:: Seed Cone Bancroftiastrobus digitata gen. et sp. nov. (Coniferales) Author(s): Gar W. Rothwell, Gene

The Seed Cone Eathiestrobus gen. nov.: Fossil Evidence for a Jurassic Origin of Pinaceae

Creator:: Rothwell, Gar W., Mapes, Gene, Stockey, Ruth A., and Hilton, Jason
Abstract:: Premise of the study: Pinaceae and nonpinoid species are sister groups within the conifer clade as inferred from molecular systematic comparisons of living species and therefore should have comparable geological ages. However, the fossil record for the nonpinoid lineage of extant conifer families is Triassic, nearly 100 million years older...
Resource Type:: Article
Full Text:: : 740- 593-1129 doi:10.3732/ajb.1100595 THE SEED CONE EATHIESTROBUS GEN. NOV.: FOSSIL

Hop cone tip blight : a new disease in the Pacific Northwest

Creator:: Bienapfl, John C.
Abstract:: A necrosis at the tip of cones was observed on hop (Humulus lupulus), cultivar "Nugget", grown in Oregon in the early 1990's. Fusarium sambucinum and F. avenaceum were recovered from symptomatic cones in 1998 and preliminary inoculation experiments suggested both Fusarium species could cause hop cone necrosis. Studies were carried...
Resource Type:: Masters Thesis
Full Text:: Master of Science in Botany and Plant Pathology presented on September 24, 2003. Title: Hop Cone Tip

Meta-Analysis Reveals a Critical Period for Management of Powdery Mildew on Hop Cones

Creator:: Nelson, Mark E., Gent, David H., and Grove, Gary G.
Abstract:: Results of 28 field trials conducted over a 12-year period investigating management of hop powdery mildew caused by Podosphaera macularis were quantitatively summarized by meta-analysis to compare product efficacy and use patterns by mode of action as defined by Fungicide Resistance Action Committee (FRAC) groups. Availability of original observations enabled...
Resource Type:: Article
Full Text:: cone development, defined in this analysis as 20 July to 10 August, as compared with all other

A Lower Cretaceous (Valanginian) seed cone provides the earliest fossil record for Picea (Pinaceae)

Creator:: Klymiuk, Ashley A. and Stockey, Ruth A.
Abstract:: Premise of study: Sequence analyses for Pinaceae have suggested that extant genera diverged in the late Mesozoic. While the fossil record indicates that Pinaceae was highly diverse during the Cretaceous, there are few records of living genera. This description of an anatomically preserved seed cone extends the fossil record for...
Resource Type:: Article
Full Text:: diverse seed cone morphologies. These fossils include the newly described Jurassic Eathiestrobus

Fungi associated with Douglas-fir seed during cone development, seed processing, and storage

Creator:: Gordon, Lewin Roland
Abstract:: The Pacific Coast form of Douglas-fir in natural forest succession is an intermediate species thriving in the Coast Range and Cascade Mountains of the Pacific Northwest. This species constitutes 26 percent of the standing timber in the United States, and 24 percent of the nation's annual timber harvest. Characteristics of...
Resource Type:: Masters Thesis
Full Text:: Fungi Associated with Douglas-Fir Seed During Cone

Origin and differentiation of the seed cone of Pseudotsuga menziesii (Mirbel) Franco

Creator:: Owens, John N.
Resource Type:: Dissertation
Full Text:: Differentiation of the Seed Cone of Pseudotsuga Menziesii (Mirbel) Franco Abstract approved (Major Professor

Evolution and Phylogeny of Gnetophytes: Evidence From the Anatomically Preserved Seed Cone Protoephedrites Eamesii gen. et sp nov. and the Seeds of Several Bennettitalean Species

Creator:: Rothwell, Gar W. and Stockey, Ruth A.
Abstract:: A fossil seed cone with characters that have been hypothesized as transitional to the origin of crown group gnetophytes has been discovered in Lower Cretaceous deposits on Vancouver Island, British Columbia, Canada. This cone, described as Protoephedrites eamesii gen. et sp. nov., provides the first anatomically preserved fossil evidence for...
Resource Type:: Article
Full Text:: Anatomically Preserved Seed Cone Protoephedrites eamesii gen. et sp. nov. and the Seeds of

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:: preparation of this dissertation. Most of all, thanks should go to Dr. W. W. Chilcote, Associate Professor

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

Creator:: West, Neil E.
Abstract:: Montane forest vegetation as it occurs on the east flank of the central Oregon Cascades has provided excellent conditions for a "natural experiment" in the use of various methodologies in studying vegetational distribution. This "experiment" has reflected on some theory and practice for the discipline of plant synecology. Detailed descriptions,...
Resource Type:: Dissertation
Full Text:: sympathetic understanding of his major professor, Dr. W. W. Chilcote. Many personnel of the United States

ScholarsArchive@OSU

Diversity of ancient conifers: The jurassic seed cone bancroftiastrobus digitata gen. et sp. nov. (coniferales)

The Seed Cone Eathiestrobus gen. nov.: Fossil Evidence for a Jurassic Origin of Pinaceae

Hop cone tip blight : a new disease in the Pacific Northwest

Meta-Analysis Reveals a Critical Period for Management of Powdery Mildew on Hop Cones

A Lower Cretaceous (Valanginian) seed cone provides the earliest fossil record for Picea (Pinaceae)

Fungi associated with Douglas-fir seed during cone development, seed processing, and storage

Origin and differentiation of the seed cone of Pseudotsuga menziesii (Mirbel) Franco

Evolution and Phylogeny of Gnetophytes: Evidence From the Anatomically Preserved Seed Cone Protoephedrites Eamesii gen. et sp nov. and the Seeds of Several Bennettitalean Species

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

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

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