science

Osmunda wehrii

Osmunda wehrii is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Osmunda wehrii rather than just read about it. In short: Osmunda wehrii is an extinct species of fern in the modern genus Osmunda of the family Osmundaceae. Osmunda wehrii is known from Langhian age Miocene fossils found in Central Washington.

Key takeaways

Osmunda wehrii belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Osmunda wehrii to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Osmunda wehrii from memory before moving on to harder problems.

Reference excerpt

Osmunda wehrii is an extinct species of fern in the modern genus Osmunda of the family Osmundaceae. Osmunda wehrii is known from Langhian age Miocene fossils found in Central Washington.

History and classification The species was described from specimens of silicified rhizomes and frond bases in blocks of chert. The cherts were recovered from sediments outcropping near the contact of the Roza Basalts and the overlying Priest Rapids Basalts, designated the type locality, near the town of Beverly, Washington by Fred Brinkman of Sunnyside, Washington. Further specimens of O. wehrii have been found at the "Ho ho" site, one of the "county line hole" fossil localities north of Interstate 82 in Yakima County, Washington. The "Ho ho" site works strata which is part of the Museum Flow Package within the interbeds of the Sentinel Bluffs Unit of the central Columbia Plateau N2 Grande Ronde Basalt, Columbia River Basalt Group. The Museum Flow Package interbeds are dated to the middle Miocene and are approximately 15.6 million years old. The holotype specimens, two pieces of the same chert specimen containing rhizomes and frond bases, are preserved in the Burke Museum of Natural History and Culture as specimen numbers "4772" and "4773". The specimens of chert were studied by paleobotanists Charles N. Miller jr of University of Montana. Miller published his 1982 type description for Osmunda wehrii in the American Journal of Botany volume 69 article "Osmunda wehrii, a New Species Based on Petrified Rhizomes from the Miocene of Washington". In his type description he noted the etymology for the specific epithet wehrii, in honor of Wesley C. Wehr who made the type specimens available to Miller for study.

Description Wessiea possesses rhizomes which are approximately 4 centimetres (1.6 in) in diameter. The fossils have distinct stipular frond bases characteristic of the family Osmundaceae, while the interior of the fronds show distinct long fibers in the frond bases are both representative of the modern genus Osmunda. It is found in the chert blocks intertwined with the extinct genus Wessiea yakimaensis and anatomically preserved Woodwardia virginica, which still lives in the forests of eastern coastal North America.

References

Worked examples

Example 1 — a first encounter with Osmunda wehrii

Start with the simplest possible case. Write down what Osmunda wehrii claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Osmunda wehrii before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Osmunda wehrii ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Osmunda wehrii

In research: Osmunda wehrii appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Osmunda wehrii in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Osmunda wehrii is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinct flora of North America, Flora of the West Coast of the United States, Fossil taxa described in 1982, so understanding it makes those chapters shorter.
In everyday life: Look for Osmunda wehrii outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Osmunda wehrii in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Osmunda wehrii means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Osmunda wehrii out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Osmunda wehrii in simple terms?

Osmunda wehrii is an extinct species of fern in the modern genus Osmunda of the family Osmundaceae. Osmunda wehrii is known from Langhian age Miocene fossils found in Central Washington.

Why does Osmunda wehrii matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Osmunda wehrii?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Osmunda wehrii.