Abstract
Bovista sclerocystis is described as a new species. It was found in Mexico, growing on rich soil of a tropical forest. It belongs to section Globaria, series Albosquamosa. The most striking character of this taxon is the exoperidium composed of polymorphous mycosclereids.
This work was supported by a grant to Prof. F.D. Calonge from the Spanish Ministry of Education. We are grateful to Dr María P. Martín for useful comments on the text, to Florencia Ramírez-Guillén, curator of XAL, for her valuable help, and to Miguel Jerez, for technical assistance with SEM.