Name: Armillaria solidipes Peck
Most Confident Observations:
Copyright © 2014 Christian (Christian Schwarz)
Copyright © 2015 walt sturgeon (Mycowalt)
Copyright © 2016 walt sturgeon (Mycowalt)
Copyright © 2016 walt sturgeon (Mycowalt)
Version: 6
Previous Version 

First person to use this name on MO: Nathan Wilson
Editors: Joseph D. Cohen


Rank: Species

Status: Accepted

Name: Armillaria solidipes

ICN Identifier: missing

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Author: Peck

Citation: Bull. Torrey Bot. Club 27(12):611 (1900)

Deprecated Synonyms: Armillaria ostoyae (Romagn.) Herink

Misspellings: Amillaria ostoyae


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Physalacriaceae

Genus: Armillaria

Notes on Taxonomy: [Edit]

This species used to be widely known as A. ostoyae. However, this name was deprecated in favor of A. solidipes based on the following paper:

Burdsall, H. H., Jr., and T. J. Volk. 2008. Armillaria solidipes, an older name for the fungus called Armillaria ostoyae North American Fungi 3(7): 261-267. Published August 29, 2008

See also Tom Volk’s Mushroom of the Month for September 2008.

Here’s Peck’ original description, from Bull. Torrey Bot. Club 27(12):611 (1900):

Armillaria solidipes
Pileus fleshy, convex, even, glabrous, tawny or yellowish brown, tinged with red in drying, flesh whitish; lamellae rather close, adnate or slightly decurrent, white or whitish; stem long, firm solid, colored like the pileus.
Pileus 2.5 – 5 cm. broad; stem 10 – 25cm. long, 6 -12 mm thick.
Densely cespitose. About spruce stumps. Colorado. September. E. Bartholomew. Spores not seen.

There was also discussion of this taxon on MO under the Name Armilaria ostoyae. Here’s a revised version of that discussion:

Paraphrased from Darvin’s comment on Observation 4530:

“In California, both Armillaria mellea and A. solidipes have a thick, felty annulus and they are the only Armillaria species here to have that character. They differ by the color of both the cap and the annulus. A. mellea has a white to yellow edge on the annulus, the cap is honey yellow and the disc is darker than the margin giving it a two-tone appearance. The cap is smooth and the hairs are indistinct. A. solidipes has a brown edge on the annulus, the cap is brown with dark hairs.”

Another quick rule is that A. mellea tends to grow on hardwoods and A. solidipes on conifers. Tom Volk definitely id’ed a collection from southern California growing on hardwood as a slightly unusual form of A. mellea. I also sent him a sample from Santa Cruz that came out as A. mellea. Apparently the California material mated with the true A. mellea, but it was not a typical mating. Macroscopically I remember Tom noting that the California material has a scalier cap than classic A. mellea (which is smooth). Based on his key it looks like microscopy and and in particular looking for clamps at the base of the basidia is the only way to be sure. Personally I have a hard enough time find a good basidia, much less figuring out whether there’s a clamp at the base.

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