A study of the Prince of Wales Island alpine areas was undertaken
to determine what species occur in the region and to describe
plant communities making up the alpine vegetation.
For one month in 1972, specimens were collected and 78 micro-plots
were analyzed for cover, frequency and constancy data. Three...
Under defined cultural conditions, zygotes of the brown alga
Fucus distichus L. Powell divide synchronously to form two-celled
embryos at approximately 24 hours after fertilization. These two
cells differ from one another in gross morphology, ultrastructure,
cytochemistry, and developmental fate. Cytochemical staining and
autoradiography indicated that a sulfated polysaccharide was...
The developmental cytology of the elaiosome of
Dicentra formosa (Andr.)Walp. was investigated from the
time of initial differentiation until complete maturation.
Light and transmission electron microscopy studies
showed that the elaiosome becomes differentiated from
epidermal tissue in the prefertilized ovule. At this time
the cells are characterized by their large...
The teliospore of Tilletia caries germinates to produce a promycelium
with a whorl of primary sporidia at its tip. The time between
emergence of the promycelium and the development of primary sporidia
averaged 2.3 h. Fusion between compatible sporidia occurred within
an additional 3.8 h. Primary sporidia appeared to be...
The ability of N,N'-diphenylurea (DPU) to substitute for cytokininactive
adenine derivatives in promoting callus growth of Phaseolus lunatus
and Nicotiana tabacum has been examined. In general, DPU stimulated
callus growth of P. lunatus at high concentrations and the growth of
most callus tissues was irregular, while the response of tobacco...
Black Butte presents a unique natural laboratory for ecological
study. It is a volcanic cone of uniform configuration located in the
rain shadow on the east flank of the Oregon Cascades. Soils are of
very recent origin with no obvious development of horizons.
Physical and chemical analysis revealed little dissimilarity...
A taxonomic and ecologic study was made of the
vascular plants of a section of the Owyhee River Canyon
of Malheur County, Oregon. The particular study area is
known as Three Forks, and is located at the junction of
the North Fork of the Owyhee River, East Fork of the...
Many topographic units in the state of Oregon have been only partially explored botanically and very few areas have been collected intensively. Two such areas were selected and a detailed investigation was made of the vegetation. Fairview Mountain and Iron Mountain are strategically located geographically and climatically. The former in...
Laminated root rot of Douglas-fir (Pseudotsuga menziesii (Mirb.)
Franco) caused by the fungus Phellinus weirii (Murr.)Gilbertson was
studied in two successive stands in the Oregon Coast Range. Damage
due to the disease in a 60-year-old second-growth stand was compared
with incidence in the preceding 300-year-old stand on the same site....
A two phase investigation was undertaken in an attempt to determine the effects of variations in salinity on the distribution of benthic estuarine diatoms. The estuary studied was that of the Yaquina River which originates in the Coast Range of western Oregon and discharges into the Pacific Ocean at the...
Successional patterns of attached estuarine diatoms were investigated
using laboratory model ecosystems. Artificial substrates
of acrylic plastic were exposed to 0, 4, and 10 hours of desiccation
per day. Diatom assemblages that developed under temperatures
normal for Yaquina Bay, Oregon (control ecosystem) were compared
to assemblages that developed at temperatures...
The vegetative communities in the subalpine meadows of Hunts
Cove, Mt. Jefferson, and some of the major environmental factors
affecting them were studied in the summer of 1971. Hunts Cove is in
the subalpine Tsuga mertensiana parkland of the Central Oregon High
Cascades. Habitats within the Cove vary considerably; elevation...
Sand dunes are found along the coasts of most of the large land
masses of the world. Because of their proximity to man and his
activities, the maritime sand dunes of Europe, particularly Germany,
France, Holland and Scandinavia, have the longest history of stabilization
activities and botanical investigation. There are...
Sediment samples were collected from eight sampling sites
along the Yaquina Estuary, Oregon from Yaquina Bay to Elk City near
the head of the estuary. Samples were collected in November 1973,
February 1974, May 1974 and August 1974 from two or three intertidal
levels depending on the magnitude of the...
Sediment was fertilized with f/2 algal growth medium
in situ and in the laboratory daily for one week. Sampling
strategy incorporated two intertidal heights and two sites.
Experiments were done in August and January. No significant
changes in chlorophyll a or diatom community structure
were observed after ten days of...
The purpose of this study was to develope a plant community classification
within the Siskiyou mountains, a small range within the Klamath
geological province well known for its geologic and floristic diversity.
Forest land managers have expressed the need for identification of
basic Land classes that will aid in the...
The purpose of the work is to enable students of botany to identify
accurately Oregon ferns, both as living plants and as dried specimens.
Therefore, it provides vegetative keys to the families, genera
and species of the ferns (Class FILICINAE) found in Oregon. Correct
names have been determined using the...
Cambial activity was studied in trees infested by the balsam
woolly aphid and in non-infested trees of grand and subalpine fir.
Infested and non-infested samples of grand fir were collected near
Corvallis during 1968 and 1969. Samples of subalpine fir, noninfested
and infested, were collected near Odell Lake, at approximately...
Mitotic activity in the vascular cambium was determined from
ten samples from a single internode in each of four Douglas-fir
[(Pseudotsuga menziesii (Franco.) Mirb.)]trees. Counts of interphase and mitotic nuclei from nine cores in each sample piece
were averaged and expressed as the frequency and mitotic index.
The sampling error...
Abies lasiocarpa (Hook.) Nutt. (sub-alpine fir) trees of comparable
vigor growing in eastern British Columbia were studied in
order to determine the effects of cork bark disease on phellogen and
vascular cambium activity.
Diseased trees form hard deeply fissured rhytidome several
inches thick over large areas of the bole when...