I know an exact species match might be tricky, but reasonable guesses, or help figuring out what section these are in, would be great so I can give them the rest they need. Or even IF they need much of a rest.
The den on the left here was marked as anosmum, but the one on the right was "Den. ??" and I, too, am at a loss.
The Den in the bottom photo fits the plant appearance of Den anosmum described in Orchid Wiz,(ORIGIN/HABITAT: Widespread. Plants are found from the Philippines to New Guinea, including Borneo and many islands in Indonesia. They are also found in Malaya, peninsular Thailand, Laos, Vietnam, and Sri Lanka. On Luzon Island and in Davao Province on Mindanao Island in the Philippines, plants grow in mountain forests usually below 2450 ft. (750 m). D. anosmum often grows in association with Aerides quinquevulnerum and Anota violacea. In Papua New Guinea, plants are common in the Bulolo and Wau areas where they grow on rough-barked trees from sea level to 4250 ft. (0-1300 m). -- Source: Charles Baker) as for the top photo good luck till it flowers.