This collection of original materials consists mainly of notebooks and loose pages of drawings in various media with related notes; the topics include apples, Biscutella, “Fichas de Macromicetos,” and “Trabajos Botánicos Originales Sifónogamas II (1928–1929).” There is also a notebook of appreciations (mainly handwritten) from his students (1956–1957), copies of various of his publications, and miscellaneous items including a typescript list (1959) of his works and publications. All items are in Spanish unless otherwise noted.