The boletes are closely related to the agarics (fungi with gills). Many boletes display colour changes when the flesh is cut, so that whitish or yellowish tissue becomes spectacularly greenish blue due to enzyme reactions triggered by oxygen in the air. Boletes are very important in the Australian bushland as mycorrhizal partners, but they also provide food for the larval stages of many insects.” Image taken in riparian zone at Sportsman Creek wildlife refuge.
Reference; Young, A.M. Field Guide to the Fungi of Australia.
I.D. courtesy of Don Gover.
Further reference; www.sydneyfungalstudies.org.au