| Summary: | <i>Cystolepiota</i> Singer is rarely studied in Southeast Asia; here, we survey and describe three new species of <i>Cystolepiota</i> from tropical Laos and Thailand. <i>Cystolepiota pyramidalis</i> is related to <i>C</i>. <i>fumosifolia</i> (Murrill) Vellinga and <i>C</i>. <i>pseudofumosifolia</i> M.L. Xu & R.L. Zhao, but it is distinguished by pale to pastel yellow lamellae. Second, <i>Cystolepiota thailandica</i> differs from other members in the genus by the greyish-orange granulose or powdery pileus and stipe covering made up of globose to subglobose and sphaeropedunculate elements. Furthermore, <i>Cystolepiota rhodella</i> is characterized by the pink-violet granulose covering of the pileus and stipe and white lamellae with distinctly violet edges. Each species is provided with a full description of the morphological characters, photos in situ, line drawings of the microcharacters, discussion of related and similar species, and molecular data.
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