The 4th working conference of Czechoslovak mycologists took place in Opava, September 2–5, 1969. It focused on the geographic distribution of fungi in Czechoslovakia and mapping of selected macromycetes. The meeting included excursions and a mushroom exhibition. A detailed proceedings volume was distributed prior to the event.
Kříž K., Lazebníček J. (1970): Conferencia quarta mycologorum Čechioslovakiae, Opava 2.-5. Septembri 1969. – Česká Mykologie 24(2): 104–109.
