I sent requests for reprints yesterday, but they may have gone to Noordeloos instead of you. I'm requesting them here through your profile. Hope it works this time.
Norrdeloos examined Hesler's type specimens of Entoloma, and (I think) published his findings. Probably single author. You might try Persoonia, but I only know the circumstances, not the outcome. Horak also looked at Hesler's types (during a visit here). I know he didn't like what Noordeloos had done (?including publication?), but whether Egon published is out of my memory. Tim Baroni also examined Hesler'stypes - I think he didn't publish his findings.
Dear Gevenieve, - Yes, thank you for the reprints. This does help.
Dear Ron - Yes, I have Noordeloos' book describing Hesler's and N Am. spp. I think you are correct that Egon Horak did not publish his type studies of N. Am. material.
There appears to be a very conservative (European?) approach to segregate genera and groups. However, the Noordeloos and Gates monograph points to Baroni's work and co David's papers showing monophyletic clades that have the type species of a subgenus or section contained within them. Even in cases where we can't currently cleanly separate these groups based on morphology, there is a named infrageneric taxon that determines what the name of the clade is, and in the case of two competing names, only one has priority. Simply excluding species from named clades that don't belong there solves a lot of problems, even if it leaves some species unplaced, as is common in Entomology. This is not the same situation as the one discussed in Vellinga et al. where a new genus name is being proposed, often without regard to the fallout of its effects on adjacent clades.