Abstract
A survey was carried out to determine the nature and extent of mycorrhizal infection on trees within an area of the terra firme rainforest known as the ‘Botanical Hectare’. Two methods were employed: random stratified quadrating, consisting of a collection of 52 root samples, each from a 10 cm 2 area, and direct determination of the mycorrhizal type on identified trees. Results from the first study showed that all 52 quadrats contained roots which were associated with vesicular arbuscular mycorrhizae (VAM); four of the quadrats contained roots which were ectendomycorrhizal in appearance and two contained roots which were sheathing mycorrhizal. The direct determination method showed that out of 23 tree species only three species, belonging to the genus Neea , possessed sheathing mycorrhizal roots. Over the six week period a collection of sheathing mycorrhizal basidiomes was made, containing 11 genera and at least 14 species.
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