with bootstrap values of 70 and 72 in both SSU and LSU trees, respectively. Further, all the previously reported taxa with large stromata produce perithecioid structures immersed in ascostromatic tissue, whereas G. siamensis produces discoid apothecia on the surface of a gelatinous ascostromatic ball. The discoid apothecia are sessile or very short stalked, and contain thick-walled asci with numerous ascospores originating from the same level in a single layer