Two Hemileia species (Pucciniales) producing suprastomatal columnar sori in Thailand

Abstract

We report Hemileia strophanthi and H. wrightiae for the first time from Thailand. Both species produce spores acropetally on columnar sori, that develop from a few emergent hyphae passing through narrow host stoma. Hemileia strophanthi occurs on an unidentified apocynaceous tree in Khlong Lan National Park, Kamphaeng Phet Prov. Hemileia wrightiae occurs on Wrightia arborea (Apocynaceae) in Phuket, Phuket Prov. Hemileia strophanthi has been recorded on two Strophanthus species in Indonesia in Asia and two other Strophanthus species in western and southeastern Africa. Hemileia wrightiae has been recorded on several Wrightia species in tropical and subtropical regions in Asia.