Abstract
The presence of Orchids is declining worldwide, mostly due to habitat loss and other factors like climate change, which are likely to increase in severity in the coming decades. Thus, one of the most worrying issues is that we still do not know the optimal abiotic and biotic requirements for the maintenance of many of the approximately 30,000 species of orchids.
Additionally, there are still unclear issues in orchid taxonomy, nomenclature, and systematics. This all complicates the development of effective conservation methods for this endangered plant group.
This Special Issue aims to fill in some of these gaps in our knowledge.