prof. dr. Piet Termonia, WE05 - em. prof. dr. Philippe De Maeyer, WE12 - dr. Rafiq Hamdi, WE04 - prof. dr. Lanhai Li, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (CAS), China
prof. dr. Lars Chatrou, WE11 - prof. dr. Anne Mugai, Jomo Kenyatta University of Agriculture and Technology, Kenia - dr. Ana Rita Simões, Missouri Botanical Garden, Africa & Madagascar Department, USA