astronomy

Kerry Knudsen

Kerry Knudsen is a astronomy 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 Kerry Knudsen rather than just read about it. In short: Kerry Knudsen is an American mycological taxonomist and lichenlogist at the Czech University of Life Sciences, Prague. Personal life and education Kerry Kent Knudsen was born in Alhambra, California, USA in 1950.

Key takeaways

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

Reference excerpt

Kerry Knudsen is an American mycological taxonomist and lichenlogist at the Czech University of Life Sciences, Prague.

Personal life and education Kerry Kent Knudsen was born in Alhambra, California, USA in 1950. He took a degree at Cypress College, Cypress, CA, USA and worked in the construction industry until disability forced him to retire at the end of the 1990s. He is married to the lichenologist Jana Kocourkova of Czech University of Life Sciences Prague.

Career He began to study lichen in the early 2000s and joined the Sonoran Flora Project, so beginning to work on the Acarosporales. He also began a herbarium of Southern Californian lichens and from 2003 was the unpaid lichen curator in the department of botany and plant sciences at University of California, Riverside. He developed the university's collection from 200 to 17,000 lichen specimens. He has been employed as a mycological researcher by the Czech University of Life Sciences Prague since 2015. He specialises in the order Acarosporales, which have a world-wide distribution and also focused on lichen biodiversity of southern California. This has provided some base-line data on lichen distributions and also, through comparison with older records, has identified changes in biodiversity as well as several new species of lichen. He also works on lichen distributions involving both field work and computer modelling. This includes development of ideas about the photobiont within lichen-forming fungi, in that the fungus may form a mutualistic association with different photobionts depending on environmental conditions, especially temperature.

Publications Knudsen is the author or co-author of over 200 scientific publications. They include:

Kerry Knudsen; Jessica Cho-Ah-Ying; Jana Kocourková; Eva Hodková; Jiří Malíček; Yan Wang (2025) The diversity of Acarosporaceae (Acarosporales, Lecanoromycetes) in California. Mycokeys '112 183-210. Helmut Mayrhofer; Karin Plattner; Othmar Breuss; Kerry Knudsen; Mohammad Sohrabi; M. Daud Rafiqpoor; Siegmar W. Breckle (2023) The lichenized and lichenicolous fungi of Afghanistan. Plant and Fungal Systematics 68 (2) 440-461. Rolshausen, G.; Hallman, U.; Grande, F.D.; Otte, J.; Knudsen, K.; Schmitt, I. (2020) Expanding the mutualistic niche: Parallel symbiont turnover along climatic gradients. Proceedings of the Royal Society B: Biological Sciences 287 20192311 Zamora, J.C.; Svensson, M.; Kirschner, R.; Olariaga, I.; Ryman, S.; Parra, L.A.; Geml, J.; Rosling, A.; Adamčík, S.; Ahti, T. et al. including K. Knudsen (2018) Considerations and consequences of allowing DNA sequence data as types of fungal taxa. IMA Fungus 9 167–175. Knudsen, Kerry; Kocourková, Jana; Nordin, Anders (2014) Conspicuous similarity hides diversity in the Acarospora badiofusca group (Acarosporaceae). The Bryologist 117 (4) 319-328. Lumbsch, H.T.; Ahti, T.; Altermann, S.; de Paz, G.A.; Aptroot, A.; Arup, U.; Peña, A.B.; Bawingan, P.A.; Benatti, M.N.; Betancourt, L. et al. including K. Knudsen (2011) One hundred new species of lichenized fungi: a signature of undiscovered global diversity 18 1-127. Kerry Knudsen; David L. Magney (2006) Rare lichen habitats and rare lichen species of Ventura County, California. Opuscula philolichenum 3 49-52. He has described over 60 new species of lichen and there are 4 species named after him.

References

Worked examples

Example 1 — a first encounter with Kerry Knudsen

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

In research: Kerry Knudsen appears in astronomy 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 Kerry Knudsen 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: Kerry Knudsen is common in secondary-school and first-year university syllabi. It links to neighbouring topics Academic staff of the Czech University of Life Sciences Prague, American lichenologists, Living people, so understanding it makes those chapters shorter.
In everyday life: Look for Kerry Knudsen 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 Kerry Knudsen in 20 minutes

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

Frequently asked questions

What is Kerry Knudsen in simple terms?

Kerry Knudsen is an American mycological taxonomist and lichenlogist at the Czech University of Life Sciences, Prague. Personal life and education Kerry Kent Knudsen was born in Alhambra, California, USA in 1950.

Why does Kerry Knudsen matter?

Because it connects several astronomy 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 Kerry Knudsen?

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 Kerry Knudsen.