I've never seen this mushroom before. It appears in none of the local guides or in one UK guide. The mushroom is occuring in natural forest so possibly not an import.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
The cap is about 8 cm across, no smell, no veil,
It has a look of a Marasmius unfortunately there are none in my books that size but they are European books.
Had a look at some Google images of Marasmius and (for what it is worth), I agree. Why not enter the genus as an ID, Malcolm?
University of Edinburgh and Biodiversity Observatory (OU)
Please note that there is a Southern African iSpot at http://za.ispot.org.uk where you are likely to get faster and more accurate identification of local species.
In fact, that is a bit of a lie, because most South African macrofungi appear to be of European origin, so if you would like to have a look at the ZA site and help with identifications, that would really be appreciated.
Which seems implausible, so I have reverted spelling and re-identified as fungus.
Southern Underwater Research Group
Photos licensed https://creativecommons.org/licenses/by-sa/3.0/
Thanks. Need some agreements here though to move the Likely ID.
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