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Two genera in the Ericaceae (Arbutus and Arctostaphylos) and one genus in the Pyrolaceae (Pyrola) form typical arbutoid mycorrhizas. Although there are 50 species in the genus Arctostaphylos, few have been examined for the presence of mycorrhizas. The two genera Arbutus and Pyrola have fewer species than the genus Arctostaphylos, but again a limited number have been studied in terms of their mycorrhizal associations. Little is known about the mycorrhizal status of other genera in the Pyrolaceae (e.g., Moneses, Orthilia and Chimaphila). Although the commercial importance of these genera is mostly as ornamentals, several species form important components of terrestrial ecosystems.
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