made a more comprehensive work with Hohenbuehelia than anyone else has, I think.
http://www.cybertruffle.org.uk/cyberliber/index.htm
Look up Mycotaxon 25, there’s the study on pages 321 to 453. An interesting detail there is that 4 of the species share the same anamorph (atrocoerulea var. grisea, nigra, approximans and cyphelliformis), one way of proposing that they actually are the same species..
I don’t remember exactly where, but have I read somewhere (maybe it was in Thorn & Barrons paper) that Peck had agreed that his grisea was the same as atrocoerulea, but still wanted to keep grisea as a brownish colour form, because he hadn’t seen them blue as atrocoerulea was described.
I don’t think any complete DNA studies on this genus have been made yet, so the choice to separate the species in Funga Nordica is probably not based on any new research, just a copy from Flora Agaricina Neerlandica.
