Casper van Overeem

Casper van Overeem (1 October 1893 – 28 February 1927) was a Dutch mycologist who pioneered the systematic study of tropical fungi in the Dutch East Indies (present‑day Indonesia). Initially trained as a teacher, he developed his scientific expertise under the botanist Hugo de Vries before earning his doctorate from the University of Zurich in 1920 with research on chromosome variations in Oenothera. At Buitenzorg (now Bogor), he established a mycology department at the botanical gardens' herbarium and authored the illustrated series Icones Fungorum Malayensium alongside numerous scientific publications. His career was cut short by tuberculosis at age 33, but his meticulously detailed work and extensive collections established a foundation for tropical mycology, leading to multiple fungal taxa being named in his honour.

Early life and education

Casper van Overeem was born in Weesp, Netherlands, on 1 October 1893. He attended primary school in Weesp and, in 1912, obtained a teaching qualification from a teacher training college in Amsterdam. From the age of 15, he illustrated plants and animals, focusing on morphological details observable at high magnification and combining scientific accuracy with artistic skill.