Lansium domesticum (Osbeck) Sahni and Bennet (Longkong) is a highly important and valuable fruit crop in Thailand. The mycobiota of L. domesticum has been understudied. In our survey of fungal diseases affecting fruit crops in Thailand, we observed unusual mycelial development in organically cultivated L. domesticum in Uttaradit Province. The mycelia initially appear as cords on the upper half of the young trees and spread tow...