Fruitbody thick walled, splitting from the top


 

At maturity, the fruitbody of a fungus in this sub-group is essentially a tough-walled ball (with or without some basal extension that forms a pseudo-stem) with powdery spores inside. In general, the ball splits from the top along a number of possibly irregular lines and the segments bend outwards to expose the mass of spores.

 

Most of the species in this group belong to the genus Scleroderma and these are known as earthballs. The fruitbodies, mustard-yellow in several commonly seen species, may measure up to about 7 centimetres across before splitting open and the segments (sometimes over 5 millimetres thick) have a leathery texture but often are at least slightly pliable.

 

Nothocastoreum fruitbodies are roughly spherical, 1 to 2 centimetres in breadth, greyish-orange and initially almost buried. The shell of the fruitbody is under a millimetre thick and, while fairly tough, it is brittle. Press hard enough and it will shatter. If nothing shatters it, the shell splits into numerous segments to expose the greyish spores. When empty of spores the bare whitish interior of the open fruitbody gives the impression of a multi-rayed star.

 

 

** Mycenastrum: Fruitbodies of the genus are roughly spherical, measure up to 20 centimetres across before splitting open and the segments have a tough, woody texture. It is not yet known from the local region but given the locations and habitats where it has been found, its occurrence in Canberra Nature Map area can’t be ruled out.

 


Fruitbody thick walled, splitting from the top

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Discussion

JohnBundock wrote:
16 Oct 2025
Thanks for your explanation.

Scleroderma sp.
Heinol wrote:
16 Oct 2025
See my comment about https://naturemapr.org/sightings/4699169.

Scleroderma sp.
Heinol wrote:
16 Oct 2025
See my comment about https://naturemapr.org/sightings/4699169.

Scleroderma sp.
Heinol wrote:
16 Oct 2025
For the benefit of other NatureMapr users, I have been in touch with Wendy about this sighting and I suspect it is either Mycenastrum corium or a species of Gastropila (perhaps Gastropila fragilis). They can be confused macroscopically and both are known from a number of countries. The latter would be very interesting since I know of only three reports of Gastropila from Australia. The same comment applies to Scleroderma sp. and Scleroderma sp.

Scleroderma sp.
Heinol wrote:
16 Oct 2025
Not a Scleroderma, which belongs with the puffballs & the like. This has a stem with a cap on top. The upper half of the exposed cross-section shows homogenous flesh, but in the lower half of that exposed cross-section you can see what look like a lot of vertical lines. This fungus is a bolete which means that, if you look at the underside of the cap, you’d see a spongy, pored surface. Each pore is the mouth of a tube that extends a little way back into the cap. The tubes are tightly packed and in the lower half of that cross section, what look likes a mass of vertical lines is really a mass of closely-packed tubes, seen in cross section. This bolete has dried out considerably and become distorted . The cap surface might naturally develop those polygonal ‘plates’ – but it is possible that they are an artefact produced by excessive drying, as the drying tissue ruptures. Given the state of this specimen I can say no more than ‘bolete’.

Scleroderma sp.
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