Corybas ecarinatus

This miniature species likes intermediate to warm conditions, drier in winter, and bright diffused light. 

Notoriously difficult to grow. We suggest consulting this blog by the Tarzane group

Corybas ecarinatus is a rare, mini-miniature terrestrial orchid native to the limestone cliffs of southern Thailand. Highly prized by collectors for its stunning foliage, it produces a single heart-shaped leaf with striking pink venation and a tiny helmet-shaped flower about 6 mm across

• Light: Thrives in bright, indirect light or shaded conditions. Keep out of harsh, direct sun to prevent scorching the delicate leaves.
• Temperature: Needs warm, humid conditions during its active growing season. However, unlike many tropical orchids, it has a strict dry dormancy period where all above-ground parts die off. 
• Water & Humidity: Requires consistently high humidity (70–85%). Substrates like 100% sphagnum moss or wet, porous mixes work best, but always use distilled or rainwater to avoid mineral buildup. 
• Dormancy: When the plant drops its foliage, keep the tuber completely dry for a few months in a cooler environment before resuming watering to trigger new growth

Link to photos and information on Jay’s Internet Orchid Encyclopedia

For more information and images see:
View on Wikipedia
View on iNaturalist
View on PPBC