biology

Shaggy parasol

Shaggy parasol 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 Shaggy parasol rather than just read about it. In short: Shaggy parasol is the common name for three closely related species of mushroom: Chlorophyllum rhacodes, C. olivieri and C. brunneum, found in North America, Europe and Southern Africa. C. brunneum is also found in Australia.

Key takeaways

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

Reference excerpt

Shaggy parasol is the common name for three closely related species of mushroom: Chlorophyllum rhacodes, C. olivieri and C. brunneum, found in North America, Europe and Southern Africa. C. brunneum is also found in Australia.

Taxonomy Chlorophyllum rhacodes, C. olivieri and C. brunneum were formerly known as Macrolepiota rhacodes or Lepiota rhacodes, but the name was changed on the basis of molecular phylogenetic evidence demonstrating a closer relationship to Chlorophyllum molybdites than to Macrolepiota procera. The subspecies Macrolepiota rhacodes var. brunneum was also elevated to species status as Chlorophyllum brunneum. Chlorophyllum olivieri is a closely related species that is also eaten as the "Shaggy Parasol". Many reference works spell the epithet "rachodes" rather than "rhacodes". The spelling "rachodes" was used by Vittadini when he first published the species in 1835, but was erroneous as the Greek word rhakos 'piece of cloth' should be transcribed as rhacos. Index Fungorum keeps to the original author's spelling, "rachodes".

Description The shaggy parasol is a large and conspicuous agaric, with thick brown scales and protuberances on its fleshy white cap. The gills and spore print are both white in colour. Its stipe is slender, but bulbous at the base, is coloured uniformly and bears no patterns. It is fleshy, and a reddish, or maroon discoloration occurs and a pungent odour is evolved when it is cut. The egg-shaped caps become wider and flatter as they mature. In all three species, the cap reaches about 6 to 20 centimetres (2+1⁄4 to 7+3⁄4 in) in width and the stipe grows to 5 to 20 cm (2 to 8 in) tall with a diameter up to 2 to 3 cm.

Similar species The shaggy parasol is similar in appearance to the similarly edible parasol mushroom, Macrolepiota procera. The latter grows considerably larger however, and is more likely to be found in the open than C. rhacodes, which prefers more shade and dislikes open pastures and fields. Another distinguishing feature is that C. rhacodes lacks the brown bands that are on the stem of M. procera.

Edibility The shaggy parasol is popularly praised as an edible mushroom. However, it contains toxins which can cause gastric upsets and some individuals show a strong allergic response to all Chlorophyllum species, including shaggy parasols. While Chlorophyllum rhacodes and C. olivieri are considered edible everywhere, C. brunneum is considered toxic in some European countries as it causes severe gastric upset, although no specific toxin has been identified. Furthermore, young shaggy parasols look identical to the poisonous Chlorophyllum molybdites (the mushroom that causes the most poisonings in North America yearly). Checking for a white spore print is essential as C. molybdites' print is green (older specimens having slightly green gills). As a result, this mushroom is not recommended for inexperienced hunters.

References

Illustrations

Worked examples

Example 1 — a first encounter with Shaggy parasol

Start with the simplest possible case. Write down what Shaggy parasol 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 Shaggy parasol 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 Shaggy parasol 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 Shaggy parasol

In research: Shaggy parasol 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 Shaggy parasol 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: Shaggy parasol is common in secondary-school and first-year university syllabi. It links to neighbouring topics Agaricaceae, Edible fungi, Fungi found in fairy rings, so understanding it makes those chapters shorter.
In everyday life: Look for Shaggy parasol 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 Shaggy parasol in 20 minutes

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

Frequently asked questions

What is Shaggy parasol in simple terms?

Why does Shaggy parasol 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 Shaggy parasol?

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 Shaggy parasol.