Dendrochilum contains 150 species from Burma to the Philippines. Water well. Hates to have the roots disturbed and takes a year to recover from re-potting.

Lockhartia contains 25 species spread throughout tropical America. They grow in intermediate conditions with even watering and fertilizer while growing and less in the autumn.

I need help with this orchids

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Dendrochilum - Throw away, it's a goner.
Lockhartia - Take it out of the pot. Clean off all the dead stuff and repot in fresh medium.