biology

Helicobasidium purpureum

Helicobasidium purpureum 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 Helicobasidium purpureum rather than just read about it. In short: Helicobasidium purpureum is a species of fungus in the subdivision Pucciniomycotina. Basidiocarps (fruit bodies) are corticioid (patch-forming) and are typically violet to purple.

Key takeaways

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

Reference excerpt

Helicobasidium purpureum is a species of fungus in the subdivision Pucciniomycotina. Basidiocarps (fruit bodies) are corticioid (patch-forming) and are typically violet to purple. Microscopically they have auricularioid (laterally septate) basidia. Helicobasidium purpureum is an opportunistic plant pathogen and is one of the causes of violet root rot of crops and other plants. DNA sequencing suggests that it is a complex of more than one species. The species has a conidia-bearing anamorph in the Tuberculina persicina complex that is a parasite of rust fungi.

Taxonomy Helicobasidium purpureum was first described from France in 1885 by French mycologist Narcisse Patouillard to accommodate a species with an effused, purple, corticioid fruit body and unusual curved or helicoid basidia. Patouillard described it as the only species in his new genus Helicobasidium. Patouillard was apparently unaware that Edmond Tulasne had described the same or a similar species under the name Hypochnus purpureus in 1865. Initial molecular research, based on cladistic analysis of DNA sequences, indicates that at least two species occur in the H. purpureum complex in Europe. Persoon had described a sclerotia-forming anamorph in 1801 as Sclerotium crocorum, moved by de Candolle in 1815 to his new genus Rhizoctonia. Subsequent authors described a number of additional species in Rhizoctonia which are currently considered synonyms of R. crocorum (later called Thanatophytum crocorum). DNA evidence indicates that at least two species occur in the Thanatophytum crocorum complex in Europe, one of which is an anamorph of a species in the H. purpureum complex, the other a species in the Helicobasidium longisporum complex. The rust parasite Tuberculina persicina is a further anamorph linked to Helicobasidium purpureum, but again represents a complex of at least four species, two of which are linked to H. longisporum.

Description Basidiocarps are corticioid smooth, membranaceous, purple to purple-brown. Microscopically the hyphae are easily visible, 5–8 μm diam., brownish-purple, and lack clamp connections. Basidia are tubular, curved or crook-shaped, and auricularioid (laterally septate). Basidiospores are oblong and often weakly curved, mostly 8–13 x 4.5–6 μm.

Distribution Helicobasidium purpureum has been recorded mainly from temperate areas of America, Asia, and Europe. It is reported to cause violet root rot of various crops.

References

Illustrations

Worked examples

Example 1 — a first encounter with Helicobasidium purpureum

Start with the simplest possible case. Write down what Helicobasidium purpureum 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 Helicobasidium purpureum 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 Helicobasidium purpureum 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 Helicobasidium purpureum

In research: Helicobasidium purpureum 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 Helicobasidium purpureum 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: Helicobasidium purpureum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fungal plant pathogens and diseases, Fungi described in 1885, Fungi of Europe, so understanding it makes those chapters shorter.
In everyday life: Look for Helicobasidium purpureum 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 Helicobasidium purpureum in 20 minutes

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

Frequently asked questions

What is Helicobasidium purpureum in simple terms?

Helicobasidium purpureum is a species of fungus in the subdivision Pucciniomycotina. Basidiocarps (fruit bodies) are corticioid (patch-forming) and are typically violet to purple.

Why does Helicobasidium purpureum 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 Helicobasidium purpureum?

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 Helicobasidium purpureum.