Watthana, Santi, Henrik Ærenlund Pedersen, and Somran Suddee. 2006. “Substrate Diversity, Demography, and Fruit Set in Two Populations of the Epiphyte Pomatocalpa Spicatum (Orchidaceae) in Thailand”. Selbyana 27 (2):165-74. https://ojs.test.flvc.org/selbyana/article/view/121292.