When: 2015-06-26

Collection location: Greensburg, Pennsylvania, USA [Click for map]

Who: John Plischke (John Plischke)

No specimen available


Proposed Names

85% (1)
Recognized by sight: L. crocipodium =L. nigrescens is gray.

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= Observer’s choice
= Current consensus


Add Comment
Difference between them
By: I. G. Safonov (IGSafonov)
2015-06-27 21:55:57 CDT (-0400)

I understand that nigrescens is synonymous with crocipodium. Separating the latter from rugosiceps is indeed not easy. Kuo offers the following tip:

“Separation from North America’s Leccinum rugosiceps is supported by preliminary molecular evidence (Binder & Hibbet, 2004; den Bakker & Noordeloos, 2005) and by morphology: Leccinum crocipodium has a bright yellow pore surface when young, a yellowish stem that is habitually (though not always) swollen in the mid-portion, and scabers that are frequently arranged in a pattern of lines or ridges, suggestive of a wide-meshed reticulum.
However, the presence of Leccinum crocipodium in North America is certainly debatable. Very few North American records for the taxon exist, and several of the existing records are dubious.”

You can read the whole account at http://www.mushroomexpert.com/leccinum_uncertain.html

Sequences of L. crocipodium and L. rugosiceps exist in GenBank…

difference between them
By: John Plischke (John Plischke)
2015-06-27 21:30:57 CDT (-0400)

I spent about 1/2 an hour drying to figure out the difference between crocipodium = rugosiceps and nigrescens. So many of the features seemed to be the same or very similar. I still have the collection what is the best way to tell them apart? I was hoping the chemical test would help but the one did not have results.