The herbarium of the museum, referred to by code PC, includes a large number of important collections amongst its 2 000 000 cryptogams (algae, bryophyta, fungi and lichens) specimens. These collections are constitued by a general herbarium and numerous particular collections. Among these last, Allorge, Bescherelle, Bourdot & Galzin, Heim, Hue, Montagne, Romagnesi, Sauvageau, Thuret & Bornet herbaria.