Roughly five hundred and seventy species can be found in the genus Maxillaria (list). These rainforest-inhabiting orchids are plants of the neotropics, being found only in Central and South America.
Maxillaria speciosa is an epiphyte native to Ecuador and Colombia. Its flowers are fragrant (like many others in the genus), but I don’t know what sort of fragrance it has – perhaps Andreas will comment and share that information.
Botany resource link: Fungi, from the Australian National Botanic Gardens, provides a wealth of information about mushrooms, mycelia and more!