High Quality Content by WIKIPEDIA articles! Johannes Iversen (December 12, 1904 – October 17, 1972) was a Danish palaeoecologist and plant ecologist. He was born in Sonderborg and began studies in botany at the University of Copenhagen in 1923 under professor C.H. Ostenfeld, and with considerable inspiration from prof.em. Christen Raunki?r. At first he worked with macrophyte vegetation of lakes in relation to water pH. The influence from Raunki?r is particularly evident in Iversen‘s doctoral thesis, in which he divided herbaceous plants into hydrotypes based on experiments and morphological studies: xerophytes, mesophytes, hygrophytes, telmatophytes, amphiphytes and limnophytes. In addition, halobio-types (salt tolerance) were described. He brilliantly used modern equivalents in the interpretation of pollen diagrams, e.g. his now classic studies on frost damage to ivy (Hedera) and holly (Ilex) during the severe winters of the early 1940s led to their fossil pollen being used as...

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