In subsequent publications he retained the signs ♀ and ♂ for male and female individuals but discarded ☿ for hybrids; the last are now indicated by the multiplication sign ×.
En sucesivas publicacions mantivo os símbolos ♀ e ♂ para individuos machos e femias pero descartou ☿ para os híbridos; estes últimos son agora sinalados polo signo de multiplicación ×.