tecuitlatl.

cakes of dried waterfly eggs that adhere to rocks (Primeros Memoriales); or a blue-green algae (probably spirulina) that is gathered, made into cakes, cooked over coals, and eaten as tostadas (Florentine Codex)

See: Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan (Norman: University of Oklahoma Press, 1997), 203; and the Digital Florentine Codex, Códice Digital Florentino, edited by Kim N. Richter and Alicia Maria Houtrouw, "Book 11: Earthly Things", fol. 69r, Getty Research Institute, 2023. https://florentinecodex.getty.edu/en/book/11/folio/69r Accessed 28 October 2025.