Quote:
Originally Posted by gnathaniel
Probably not Den. nobile, but definitely something in section Dendrobium (of the same-named genus), likely a hybrid involving nobile and other related species. Most of the modern complex hybrids are very temperature-tolerant, liking warm/hot and moist summers followed by cooler, drier winters. I've grown them pretty warm (upper 90s/low 100s F in almost full sun) and never had one show signs of heat stress as long as kept moist. Hard to tell from the 2nd pic, but it looks like your plant may be severely afflicted by spider mites (silvery pitting on the leaves, pleating, etc.). I'd suggest doing some repeated soapy dunks or sprays to knock back the mites. Safer's or other horticultural soaps that use potassium-based salts will be gentler on your plant, but in a pinch you can use ordinary dish detergent as long as it's very dilute; google 'soap spray mites' or something for recommended concentrations. Maintaining good humidity will also help keep mites at bay; I usually only have problems with them in the winter when indoor spaces are dry. Hope this helps! 
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Thanks Nat for your insights! I really hope it's not due to spider mites... I have checked the leaves again, but I can't see much silvery pitting. Maybe better to be save than sorry, I'll check the internet for some more info about how to spray my plants.