biology

Parmotrema reticulatum

Parmotrema reticulatum 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 Parmotrema reticulatum rather than just read about it. In short: Parmotrema reticulatum is a lichen in the ruffle lichen family, the Parmeliaceae. Description Parmotrema reticulatum, often known as the Black Sheet Lichen, is a foliose lichen whose grayish thalli grow closely to loosely attached to its substrate.

Key takeaways

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

Reference excerpt

Parmotrema reticulatum is a lichen in the ruffle lichen family, the Parmeliaceae.

Description Parmotrema reticulatum, often known as the Black Sheet Lichen, is a foliose lichen whose grayish thalli grow closely to loosely attached to its substrate. The thalli are conspicuously lobed with slightly overlapping, rounded lobes, which appear more jagged with age. It's not unusual for blackened areas to form on the upper surface.The thalli's lower surfaces are black with brown, mottled zones along the edges, and with root-like rhizines growing from the lower surface as seen at the left. Bowl-shaped apothecia rarely occur, but when they do they are small, only up to 6mm in diameter, and develop indistinct stalks, as seen below the taxonomy box.

Distribution The map registering verifiable observations of Parmotrema reticulatum on the iNaturalist page for the species documents occurrences worldwide in warm to hot areas, except in tropical rainforests and arid areas.

Habitat Parmotrema reticulatum usually grows on trees in open habitats, as well as rarely on rocks.

Human uses

As a dye Parmotrema reticulatum produces an orange dye by boiling in water, and a brown dye using the "ammonia fermentation method," with the color becoming darker the longer it is fermented. Ammonia fermentation occurs when microorganisms, under anaerobic conditions, convert organic nitrogen in waste materials into ammonia.

Medicinally In the Himalayas, Parmotrema reticulatum has been documented as a traditional treatment for coughs and throat and respiratory problems. In Mexico a tea made of the lichen has been used for kidney disorders and venereal disease. The tea is prepared in the late afternoon and drunk the next morning. A methanol extract of Parmotrema reticulatum has been found to be a promising candidate for management of breast cancers.

As a bioindicator Parmotrema reticulatum may be used to monitor air pollution caused by airborne chromium, copper, lead and zinc. These heavy metals can be accumulated even when present in the air in very low concentrations.

Synonyms These names were accepted as synonyms for Parmotrema reticulatum as of September, 2025:

Canomaculina leucosemotheta (Hue) Elix Parmelia ciliata (Nyl.) Gyeln. (Ambiguous) Parmelia laevigata var. reticulata (Taylor) Linds. Parmelia leucosemotheta Hue Parmelia macquariensis C.W. Dodge Parmelia perforata f. ciliata (Nyl.) Leight. Parmelia perforata var. ciliata Nyl. Parmelia perlata var. reticulata (Taylor) Linds. Parmelia pseudovirens Gyeln. Parmelia reticulata Taylor Parmelia urceolata f. sorediifera (Müll. Arg.) Stizenb. Parmelia urceolata var. sorediifera Müll. Arg. Parmelia urceolata var. subcetrata Müll. Arg. Parmelia virens var. sorediata Müll. Arg. Parmotrema leucosemothetum (Hue) Hale Parmotrema pseudovirens (Gyeln.) Elix Rimelia reticulata (Taylor) Hale & A. Fletcher

Etymology The genus name Parmotrema derives from the Greek word paros, meaning "cup," and the Greek trema, meaning "perforation," referring to perforations of the apothecia. The species name reticulatus is from the Latin reticulatus, meaning "a netted-like network."

References

Illustrations

Worked examples

Example 1 — a first encounter with Parmotrema reticulatum

Start with the simplest possible case. Write down what Parmotrema reticulatum 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 Parmotrema reticulatum 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 Parmotrema reticulatum 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 Parmotrema reticulatum

In research: Parmotrema reticulatum 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 Parmotrema reticulatum 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: Parmotrema reticulatum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lichen species, Lichens described in 1836, NatureServe secure species, so understanding it makes those chapters shorter.
In everyday life: Look for Parmotrema reticulatum 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 Parmotrema reticulatum in 20 minutes

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

Frequently asked questions

What is Parmotrema reticulatum in simple terms?

Parmotrema reticulatum is a lichen in the ruffle lichen family, the Parmeliaceae. Description Parmotrema reticulatum, often known as the Black Sheet Lichen, is a foliose lichen whose grayish thalli grow closely to loosely attached to its substrate.

Why does Parmotrema reticulatum 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 Parmotrema reticulatum?

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 Parmotrema reticulatum.