Around the Dandenongs including in our front yard we have been finding three variants of an Agaricus with a brownish scaled cap, and flesh that stains pinkish red.
We actually assumed these were separate species but all three - following DNA analysis - turned out to be much closer to one another than to any other recorded phylogenetic lineage.
All three were 95 or 94% close to Agaricus littoralis and 94% to Agaricus bohusii meaning these are undescribed species.
The first variant (Agaricus floral under pine) is smallish and button shaped and its staining begins pink or red and then fades to brown; its smell is floral and mildly aniseedy:
The second variant (Agaricus red stain) is a very dark-capped dense Agaricus with a much brighter red stain - most pronounced in the gill region - that macroscopically looked a lot like silvaticus (but to our suprise was not even closely related to that species):
And lastly the third variant (Agaricus front yard) is smaller, with a similar persistent veil skirt and dark scaled cap, but less red staining and a very wavy cap at maturity:
And smaller versions on the left:
As stated previously this species complex has not been recorded and is a new phylogenetic lineage closest (but quite distant from) Agaricus littoralis and Agaricus bohusii. These are so close they may all be phenotypes of one species.