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In contrast with Black, I found/observed some females of Lindneromyia dorsalis directly on Agaricus sp. mushrooms walking and ovipositing between the gills (that was really valued experience for me :)). I also reared these L. dorsalis and very similar L. hungarica from various species of Agaricus (A. arvensis mostly), in one case it was hundrets of individuals from one fruting body of this fungus.
Very easy for me was rearing of Paraplatypeza atra from very common fungus Pluteus cervinus, I have many reared specimens from numerous fruiting bodies and we agreed on (with two Czech Platypezid specialist) that this fly is most common Platypezid in Czech Republic.
I found some Agathomyia sp. too, A. wankowiczii as larvae in galls of Ganoderma lipiense (syn G. apllanatum), adult rearing is still in progress. And one female of A. unicolor on Bjernadera adusta.
Everything was in various woodland habitats, also in coniferous or mixed forests.
I never found some Platipezidae fly by sweeping or on some leaves :(

PS: I'am very interested in exchanging material/literature and advices how to collect/find specific species of Platypezidae. So be free if you want to know some details of my rearings etc.