Abstract
A new species of Morchella was described from Mount Rinjani National Park (MRNP), Indonesia, by combining comprehensive morphological characters and molecular data from four genes (ITS, LSU, Tef1, and RPB2). The species is characterized by having large ascomata, with irregular or not parallel pits shaped and ridges; enlarged based stipe; large and spheroidal to broadly spheroidal basidiospores, corrugated or maze-like with a few striations of spore surface. Comparisons with similar taxa were also carried out using morpho-molecular data. Phylogenetic analyses showed the position of Morchella from Mt. Rinjani was confirmed as a new species, and closely related to Morchella galilaea. The descriptions included macro- and micro-characters supplemented by photographs of fresh specimens, SEM images of spore ornamentations, and phylogenetic tree analysis.