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A new species of Coniochaeta from dead pistachio twigs, C. ershadii, is described from Varamin district, Tehran Province. C. ershadii differs from the similar C. gamsii by possessing smaller ascocarps covered with setae, a peridium with an irregular texture, longer and narrower asci, shorter ascospores, and by producing numerous crystals when cultivated on Leonian agar and other media. It is particularly distinguished by its ascospores with protruding ends up to 1.7-2.5 μm long. The conidiophores of the nodulisporium-like anamorph of C. ershadii produce 2-3 conidiogenous loci and cylindrical blastoconidia with attenuated bases. A dichotomous key for identification of 54 sufficiently documented Coniochaeta species is provided.