A new sequestrate fungal species associated with Adenostoma fasciculatum is
described as Rhizopogon mengei. It differs from the related species, R. ve
ntricisporus, in spore size and shape, lack of peridial staining where brui
sed and lack of peridial intracellular and encrusting pigment in KOH mounts
. This is the first confirmed report of a Rhizopogon sp. associated with an
angiosperm in nature.