biology

Hymenophyllum

Hymenophyllum is a biology 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 Hymenophyllum rather than just read about it. In short: Hymenophyllum is a genus of ferns in the family Hymenophyllaceae. Its name means "membranous leaf", referring to the very thin translucent tissue of the fronds, which gives rise to the common name filmy fern for this and other thin-leaved ferns.

Key takeaways

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

Reference excerpt

Hymenophyllum is a genus of ferns in the family Hymenophyllaceae. Its name means "membranous leaf", referring to the very thin translucent tissue of the fronds, which gives rise to the common name filmy fern for this and other thin-leaved ferns. The leaves are generally only one cell thick and lack stomata, making them vulnerable to desiccation. Consequently, they are found only in very humid areas, such as in moist forests and among sheltered rocks. They are small and easy to overlook.

Species As of October 2022, World Ferns accepted the following extant species:

Extinct species include:

†Hymenophyllum axsmithii Pigg et al (Ypresian, Eocene Okanagan Highlands North America)

See also Trichomanes, the members of which are also called filmy ferns.

References

External links Ferns of the genus Hymenophyllum observed in Cornwall More complete list of species Detailed photography of Hymenophyllum tunbrigense Filmy ferns webpage of School of Biological Sciences, University of Auckland, New Zealand J.E. Smith's original description of the genus online at Project Gutenberg

Illustrations

Worked examples

Example 1 — a first encounter with Hymenophyllum

Start with the simplest possible case. Write down what Hymenophyllum claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Hymenophyllum 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 Hymenophyllum 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 Hymenophyllum

In research: Hymenophyllum appears in biology 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 Hymenophyllum 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: Hymenophyllum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fern genera, Hymenophyllum, Polypodiidae stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Hymenophyllum 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 Hymenophyllum in 20 minutes

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

Frequently asked questions

What is Hymenophyllum in simple terms?

Why does Hymenophyllum matter?

Because it connects several biology 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 Hymenophyllum?

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 Hymenophyllum.