I am investigating two kinds of Melanoleuca sp. found in the same park, basically composed of Aleppo pine on rocky ground with many moss or wild grass lawns. One population consisted of two large specimens (one collected), and the other consisted of 10 or so scattered small fruiting bodies (2 collected). The colors are almost the same, but the former are larger (pileus 5cm across), fleshier, with upturned pileus margin, the other are smaller (pileus 2 cm across), more neat and petite, perfectly round and plane pileus and with more crowded gils.
I would love to have an indication if they are the same species (the former is an older specimen from the latter). One should be Melanoleuca melaleuca, but maybe there are other species here in the south!