Collection location: near Zaga, Posočje, Slovenia [Click for map]
Oct. 10. 2006
Lat.: 46.3135 Long.: 13.46761
Habitat: Light mixed wood, predominantly Ostrya carpinifolia and Fraxinus ornus, among grasses, steep south faced mountain slope, calcareous bedrock, warm place, precipitations 3.000 mm/year, average temperature 8-10 deg C, altitude 640 m (2.100 feet), alpine phytogeographical region.
Place: ‘Na Kolenu’, Ucja valley, southeast of Mt. Skutnik, 1.720 m (5.643 feet), East Julian Alps, Posocje, Slovenia EC
Nikon D70 / Nikorr Micro 105mm/f2.8
[admin – Sat Aug 14 02:03:39 +0000 2010]: Changed location name from ‘Near village Zaga, Posocje, East Julian Alps, Slovenia EC’ to ‘near village Zaga, East Julian Alps, Posočje, Slovenia’
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I have looked through the obs:es of acutoconica here. Though the persistens I have found can vary a lot, from pure yellow to more orange caps, white to yellow gills, and yellow to slightly orange stems, I have never seen them with such distinctly two-coloured caps as the ones you have here.
It’s just a matter of opinion if you give them ranks of species or varieties, but in my opinion, it’s always better with different species if you really are able to keep them apart. Here is a golden opportunity to do so, because acutoconica was originally described from USA, persistens from Europe, and no need to argue about which name to use..
persistens for the pure yellow one, originally described from Europe, and acutoconica for the American orange-tipped yellow one.