The new species, Tulostoma domingueziae, is described and illustrated. It was found in Polylepis australis woodlands in central Argentinean highlands. Tulostoma domingueziae is characterized by the combination of a warty exoperidium, contorted stipe covered by thin scales that break off, mouth slightly projected and the socket with up to six dentate hanging membranes. DNA sequence data demonstrated that T. domingueziae is distinct from Tulostoma species for which sequence data are available.

On the basis of morphological and molecular analysis of several specimens of Lysurus periphragmoides collected in Argentina, the examination of materials collected in the type locality of Simblum sphaerocephalum (nowadays known as L. periphragmoides), also collected in Argentina (Córdoba), and the examination of specimens of L. periphragmoides from the old world, we conclude that Argentinean and South American material identified and synonymized to L. periphragmoides by Dring in 1980 should be emended as L. sphaerocephalum. As this species lacks type material designated on its protologue, and there is no type material either, we propose a lectotype and an epitype for L. sphaerocephalum. On the basis of species descriptions found in literature, we constructed a table with relevant differences between these two species: L. periphragmoides and L. sphaerocephalum. We fully describe L. sphaerocephalum, including lecto- and epitypes, and its position within the Lysuraceae clade. This work also includes descriptions and images of Blumenavia rhacodes, Itajahya galericulata, L. cruciatus, and Phallus indusiatus from Argentina, with the aim of expanding our knowledge of their distribution ranges in the studied regions.

Geastrum minutisporum is characterized by a basidioma up to 25 mm wide, exoperidium saccate to planar, non-hygroscopic; a globose to subglobose, sessile and greyish brown endoperidium; a silky fibrillose peristoma, lighter or darker than the endoperidium and with globose, slightly asperulate basidiospores, 2-2.5-3 μm in diam., with a short apiculus up to 0.5 μm long. Specimens were collected at the Reserva Hídrica Provincial Pampa de Achala located in the upper portion of Sierras Grandes from Córdoba, central Argentina. Morphology and phylogenetic analysis based on ITS sequences support Geastrum minutisporum as a new species.