Macbrideola argentea Nann. - Bremek. & Y. Yamam.

Macbrideola aff. argentea Nann.-Bremek. & Y. Yamam. [0, 1] Loc 5: On Agl leaves, JRM133, 5 February 2009, (mc, pH = 7.9). Sporocarps dispersed, stalked with sporotheca globose. Thin stalk, 75% of total height, very dark, yellowish red at the base. Peridium violaceous brown, evanescent with a well-defined collar at the base of the sporotheca. Columella reaches the middle of the sporotheca, where it branches into two or three main branches. Capillitium rigid, hollow, thin, not anastomosed, reaching from the apex to the columella, with spiny free ends and dichotomous ramifications. Spores 9.6–10.4 µm, globose, verrucose with clusters of warts. A species close to Mapimí specimens is M. argentea Nann.-Bremek. & Y. Yamam., which has smaller spores (7–8.5 µm) and evanescent peridium (Nannenga-Bremekamp & Yamamoto 1983). If confirmed, this species would be the first record for the Neotropics (Lado & Wrigley de Basanta 2008).