science

Woodsiaceae

Woodsiaceae 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 Woodsiaceae rather than just read about it. In short: Woodsiaceae is a family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the suborder Aspleniineae.

Key takeaways

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

Reference excerpt

Woodsiaceae is a family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the suborder Aspleniineae. The family can also be treated as the subfamily Woodsioideae of a very broadly defined family Aspleniaceae sensu lato. In PPG I, the family contained only one genus, Woodsia. In 2020, Physematium was split off from Woodsia on the basis of molecular phylogenetic evidence. As of June 2023, Plants of the World Online continued to treat Physematium as a synonym of Woodsia.

Taxonomy Woodsiaceae formerly included the members of the families Athyriaceae and Diplaziopsidaceae, but analysis has consistently shown that they should be treated as separate families. The following cladogram for the suborder Aspleniineae (as eupolypods II), based on Lehtonen (2011), and Rothfels et al. (2012), shows a likely phylogenetic relationship between the Woodsiaceae and the other families of the Aspleniineae.

A molecular phylogenetic study published in 2020 largely confirmed the position of the family. It included 122 accessions representing about 43 species then placed in the sole genus Woodsia. It showed that Woodsia was deeply divided into two clades, which the authors recognized as two genera Physematium and Woodsia.

Genera As of June 2023, World Ferns accepted three genera:

Physematium Kaulf. Woodsia R.Br. ×Woodsimatium Li Bing Zhang, N.T.Lu & X.F.Gao = Woodsia × Physematium

Distribution Species of Woodsia are native to northern North America and Eurasia, and further south in the east of Asia, from western mainland China to Taiwan. Although the distributions overlap, species of Physematium generally have a more southern distribution, being found further south in North America and in northern South America as well as in Asia, with a few species in Africa and Madagascar.

References

Illustrations

Worked examples

Example 1 — a first encounter with Woodsiaceae

Start with the simplest possible case. Write down what Woodsiaceae 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 Woodsiaceae 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 Woodsiaceae 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 Woodsiaceae

In research: Woodsiaceae 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 Woodsiaceae 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: Woodsiaceae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fern families, Polypodiales, so understanding it makes those chapters shorter.
In everyday life: Look for Woodsiaceae 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 Woodsiaceae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Woodsiaceae 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 Woodsiaceae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Woodsiaceae in simple terms?

Woodsiaceae is a family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the suborder Aspleniineae.

Why does Woodsiaceae 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 Woodsiaceae?

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 Woodsiaceae.