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Twenty three different Xylariaceae Tul. & C. Tul were isolatedfrom samples collected from forest zones of Thailand and Philippines.The fungal samples were characterized based on morphological characteristics and nuclear ITS1-5.8S rDNA-ITS2 region sequences. Ten species of Xylaria, two species of Hypoxylon, Biscogniauxia, Rosellinia and one species of Annulohypoxylon and Entonaema were found. Entonaema the distinctive genus of Xylariaceae, isolated in the study from Thailand samples showed a close relationship with Xylaria in phylogenetic tree. Xylariaceous species identified at molecular level showed significant similarity of the morphological characters, such as stromal structure, ascal apex and the germ slit of ascospores. In addition, three species of Arthrinium, two species of Pestalotiopsis were also isolated and characterized in the study. A phylogenetic affinity of Pestalotiopsis with Xylariaceae was found.