Under a big old poplar (Populus Nigra) in a park this winter i found a whole bunch of black poplar mushrooms, Agrocybe Aegerita, some of which were huge, unfortunately the rain had got them and but for one or two they were all soggy and turning to mush. The Pioppino is considered a choice edible in Europe and is widely cultivated as a gourmet mushroom. I find it interesting that they grow with just a few varieties of trees like poplars and willows, but do not appear to be mycorrhizal. Its also fascinates me how they made it half way round the world, mushrooms are after all great travelers, hitching a ride in this case in the roots and soil of a poplar seedling, probably all they way from Europe. Perhaps they grew tired of the cold winters in their native clime.
The mushroom caps of Agrocybe Aegerita are quite distinct, cream coloured margins with the rust brown flush in the center when young, they also have these interesting little dimples and folds that seem quite common in this species. They can get quite large, some of the specimens I found were more then 150mm across. They have long thin woody stems and light grey gills. The spores are tobacco brown. Fried in butter with a bit of salt the flavor and texture were excellent. I have cloned the wild specimens that I found and hopefully I can get them to fruit in the future. Agrocybe Aegerita are high on my list of quality edible fungi, if only I can find more Poplars!
In Australia we have a few species of Agrocybe mushrooms, Agrocybe parastica grows on some rain forest trees in the area though is not very common. The agrocybe praecox cluster is also present but again is not very common, I have only found one member growing on a grassy bank in my front yard. I have also found what looks like another agrocybe species, edibility unknown, growing at the north coast botanic gardens in Coffs Harbour. Photo below. Not all the members of the agrocybe family are edible and it can be hard to distinguish the different species. As Agrocybe Aegerita is found growing with poplars and willows it is reasonably easy to ID.