Índice: Main Institution
- Macedonian Academy of Sciences and Arts (6)
- Macedonian Biological Society (5)
- Macedonian Ecological Society (5)
- Mariborska razvojna agencija (1)
- MAVA (Fondation pour la Nature) (1)
- Mediterranean Plant Specialist Group (IUCN/SSC)/Maich Crete (10)
- Metropolitan City of Cagliari (1)
- Miljøfaglig utredning (67)
- Ministry of environment and spatial planning (1)
- Ministry of Natural Resources and Environmental Protection of the Republic of Belarus (1)
- Ministry of Natural Resources of the Russian Federation (Rosprirodnadzor of the Komi Republic) (24)
- Ministry of the Environment of the Czech Republic (17)
- Montenegrin Ecologists Society (2)
- Mordovia State University (14)
- Municipality of Fiorano Modenese (1)
- Municipality of Iglesias (1)
- Municipality of Modena (6)
- Municipality of Seui (4)
- Municipality of Skyros (10)
- Musée national d'histoire naturelle Luxembourg (16)