Pseudobulbs, which are somewhat enlarged or thickened succulent stems, are common in epiphytic orchids. Nitrogen can be transported from old to young pseudobulbs and between leaves and pseudobulbs.

Bletilla Rchb. f. (Orchidaceae) is a small genus with great economic value distributed in Asia, and China is the distribution center of Bletilla with four species. The dried pseudobulb of B. striata ...