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Myxomycetes from 10 localities in the central plains of the Sonoran desert were studied using the moist chamber culture technique. Thirty-three species have been identified, of which five (Comatricha mirabilis, Cribraria confusa, Didymium eremophilum, Perichaena luteola, and P. stipitata) represent new records for Sonora, and Comatricha mirabilis is cited for the first time from Mexico. Light and scanning electron microphotographs illustrate the most diagnostic characters of these species, which are rare or scarcely mentioned in the literature.

The genus Carbomyces is reported for the first time for the Mexican mycobiota. Carbomyces emergens, C. gilbertsonii, and C. longii were collected in the Chihuahuan desert, Mexico. Carbomyces emergens was more frequently collected and more widely distributed, while C. gilbertsonii and C. longii each have a restricted distribution and represent second records worldwide. The phenology, chorology, and macro-/microscopic characters (including spore ornamentation by SEM) are outlined for all species.

Neosecotium macrosporum, previously known only from two USA records, is reported for the first time in Mexico. Observations of macro-and microscopic characters including for the holotype and the Chihuahua collection are presented. SEM photomicrographs illustrating spore ornamentation are included.

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