Peter Nielsen (botanist)
Encyclopedia
Peter Nielsen was a Danish botanist
Botany
Botany, plant science, or plant biology is a branch of biology that involves the scientific study of plant life. Traditionally, botany also included the study of fungi, algae and viruses...

 and plant pathologist. He was born at a farm in Vonsbæk parish in the Duchy of Schleswig and started working in agriculture. He became a school teacher at Ørslev in Zealand and started studying the local flora
Flora
Flora is the plant life occurring in a particular region or time, generally the naturally occurring or indigenous—native plant life. The corresponding term for animals is fauna.-Etymology:...

. He remained interested in plants useful to agriculture and in plant pathogens. He was a quite prolific writer on these topics. He undertook meticulous studies of rust fungi.. He was the first to describe the host alternation of Puccinia poarum
Puccinia
Puccinia is a genus of fungi. All species in this genus are obligate plant pathogens and are known as rusts .Examples of Puccinia rusts and the diseases they cause:* Puccinia asparagi - Asparagus rust...

 between grasses and Tussilago farfara.
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