Bulbophyllum dayanum

(The photos are from April 12, 2020)

This species makes rather weird flowers. The flowers are located at the base of pseudobulbs, so it is pretty difficult to take pictures of them. Also, I took photos when the flowers were starting to wilt, so I couldn't get good photos. But I made the dissection, so I'm posting the photos here. I'll update with a better photos next time when it flowers. But it is rather a slow grower; I've had it for 5 years (purchased in May 2015 from Far East Agriculture), and this is the first flower. So I'm not sure when it will flower next.

According to IOSPE (I didn't double check), this species is fairly wide spread; from India, Myanmar, Cambodia, Vietnam and Thailand at elevations of 0-1300m. I have been growing it at a cool-end of intermediate temperature; the max/min daily temperature is 29/18C (84/65F) in the summer and 21/13C (70/55F) in the winter. I was growing it at PPFD of 70 µmol m^-2 s^- , but recently it was moved to a dimer area (45 µmol m^-2 s^-1). It took for a while to start growing after the import. But as you can see from the increase in the leaf size, it has been growing better recently. It makes fairly long internodes, so it might ramble out of the pot eventually.

Sepals removed.

Sepals and the petal removed.

The left petal and lateral sepal is showing the abaxial surface (back, toward the ovary), the others are showing adaxial (front) surface. The ruler is metric, the small increment is 1mm.