The fruit body is a bolete that grows on the ground. The cap is brown, smooth and dry and may be cracked; the pore surface below the cap is yellow; the stem is brown and very robust, often of much the same width as height. These are very ordinary colours for a bolete. However, if you see such a bolete with a cap 30 centimetres or more in diameter, you can be confident that you have this species. The caps can grow to a metre in diameter.
On the other hand, fully mature specimens can be as small as 10 cm in diameter and, with the smaller specimens, a microscopic analysis is needed to be sure that you have this species, rather than some other nondescript, brown bolete. A number of other species may have caps to 20 centimetres or so in diameter.
The flesh or pores may bruise bluish when damaged, but some people report no colour change after such damage.
Sometimes you see just one specimen but often a group of them will appear, possibly spread out over many square metres.
This is a native species, the original description of which was published in 1845, based on a specimen collected in Western Australia
The spore print is yellowish brown.
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Phlebopus marginatus has been recorded at: