The Wrong Botanist

First day cover from 2013, commemorating the 100th birthday of professor Miklós Ujvárosi issued in 2013. 

Sent by Micu (Hungary).

As a curiosity: in 2003, it was issued a stamp dedicated to another Hungarian botanist, Rezső Soó. The portrait on the stamp, though, did not feature the right man but Miklós Ujvárosi. The stamp was quickly withdrawn, but some of those are still in collections. Some philatelists adore collecting freaks and errors!