biology

Panaeolus olivaceus

Panaeolus olivaceus 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 Panaeolus olivaceus rather than just read about it. In short: Panaeolus olivaceus is a widely distributed, rarely identified, little brown mushroom that contains the hallucinogen psilocybin. It is often mistaken for Panaeolus foenisecii and is distinguished by its black spore print and darker gill coloration when mature alongside a slightly thicker stem.

Key takeaways

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

Reference excerpt

Panaeolus olivaceus is a widely distributed, rarely identified, little brown mushroom that contains the hallucinogen psilocybin. It is often mistaken for Panaeolus foenisecii and is distinguished by its black spore print and darker gill coloration when mature alongside a slightly thicker stem. It is even more easily mistaken for Panaeolus cinctulus or Panaeolus fimicola and can be distinguished from them both by its slightly roughened spores. It is also easily confused with Panaeolina castaneifolia, a species which has spores that are dark brown and significantly more roughened.

Description Cap: 1 — 4 cm across, Distinctly campanulate then subhemispheric to convex, becoming broadly conic, not fully expanding, incurved margin when young, dark smoky-grayish to dark cinnamon, drying to a straw-yellow or slightly olive-gray color, remaining more reddish-brown towards the center, hygrophanous, smooth, sometimes striated or finely corrugated, flesh thick and firm. Gills: Adnate to adnexed, close, thin, pallid, mottled, slightly olive-greenish, becoming dark purplish gray-black in age, edge whitish. Stipe: 4 — 7.5 cm by 3 — 6 mm thick, equal to slightly tapering at the base, hollow, brittle, pruinose and slightly striate, no veil remnants. Grayish to ochraceous, tan or purple at the base. Spores: Black, slightly roughened, 12 — 17 x 7 — 10 micrometers, elliptic, rugose or verrucose. Microscopic features: Basidia 24 — 28 x 10 - 12 micrometers. Cheilocystidia 20 — 38 x 5 — 10 micrometers, abundant, neck often flexuous and apices usually obtuse, thin walled and hyaline, pleurocystidia rare or absent, not projecting beyond plane of basidia.

Habitat and formation Panaeolus olivaceus grows scattered to gregariously in rich grassy areas, from late summer through December, across North and South America, likely more widely distributed; it has been collected in the U.S. states of Washington, Oregon, Florida, Georgia, South Carolina, Minnesota, Canada's Quebec, New Zealand and in the United Kingdom.

Gallery

Illustrations

Worked examples

Example 1 — a first encounter with Panaeolus olivaceus

Start with the simplest possible case. Write down what Panaeolus olivaceus 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 Panaeolus olivaceus 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 Panaeolus olivaceus 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 Panaeolus olivaceus

In research: Panaeolus olivaceus 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 Panaeolus olivaceus 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: Panaeolus olivaceus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Entheogens, Fungi described in 1945, Fungi of North America, so understanding it makes those chapters shorter.
In everyday life: Look for Panaeolus olivaceus 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 Panaeolus olivaceus in 20 minutes

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

Frequently asked questions

What is Panaeolus olivaceus in simple terms?

Why does Panaeolus olivaceus 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 Panaeolus olivaceus?

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 Panaeolus olivaceus.