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SUMMARYFrom a literature search, information has been compiled on the mycorrbizal status under field conditions of 20 or more species in each of 25 families. Tbe percentage of species which are mycorrbizal ranged from 100% in seven families to 8% in Cruciferae, many families having additional species that are sometimes mycorrhizal. No family in the list was consistently non-mycorrbizal. Apart from tbe Ericaceae, tbe families were either predominantly ectomycorrbizal or predominantly VA mycorrbizal. However, almost all families bad at least one example of each of tbese mycorrbizal types.

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