Observation 12609: Lentinus tigrinus (Bull.) Fr.
When: 2008-10-13
No herbarium specimen

Notes: These very strange mushrooms appear to have neither gills nor pores. The flesh is very tough and leathery.

Proposed Names

-45% (3)
Eye3
Recognized by sight
82% (6)
Eye3 Eyes3
Used references: Smith, Smith & Weber’s: How to Know the Non-Gilled Mushrooms, p. 265: "… on hardwood logs in wet places; spores hyalne, smooth, inamyloid. Pileus 3-7cm broad, dry, minutely squamulose around the disc the squamules dull brown, ground color pallid to dingy ochraceous, gleba vertailly lacunose or gill-like; stipe 2-6cm long, 3-7mm thick … Midwest, common at times. It has been shown that this “species” is merely a variant of the American form of Lentinus tigrinus."

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Wanted: Alive
By: David Hibbett (dhibbett)
2009-03-24 20:14:19 PDT (-0700)

Hi Dan,
That is a nice photo of the “secotioid” form of Lentinus tigrinus. It is a naturally-occuring developmental mutant of the typical agaricoid form of this species. It is fascinating because, as Tom Volk says, it looks like an evolutionary intermediate between a hymenomycete and a gasteromycete. I did some work on this years ago (I am a mycologist) and have been wanting to get back to it for some time. If you (or any other MO participant) find this again, I would be grateful to receive some fresh material for culturing—I’ll pay for the express shipping. Here’s my lab website for contact information, etc: http://www.clarku.edu/faculty/dhibbett/
Cheers,
David Hibbett

Yes, dry periods
By: Dan Molter (shroomydan)
2008-10-14 22:58:20 PDT (-0700)

It flooded twice this spring, and it has been really dry since mid August, only two or three days of rain.

Interesting
By: Paul Derbyshire (Twizzler)
2008-10-14 22:28:44 PDT (-0700)

It seems that we were both right. It has gills behind a thick partial veil, as I suspected; but it is becoming something else, as you suspected, with the partial veil never breaking and the gills turning into a generalized gleba.

I imagine a floodplain-adapted species might gasterize as an adaptation to the big swings in moisture; does this particular floodplain get quite dry in between floods?

Lentodium squamulosum/ Lentinus tigrinus
By: Tom Volk (TomVolk)
2008-10-14 20:10:47 PDT (-0700)

weird fungus. I have seen it several times, ALWAYS on a flood plain. It’s apparently on its (evolutionary) way to becoming a “Gasteromycete”

Lentinus tigrinus var squamosus
By: Ron Pastorino (Ronpast)
2008-10-14 18:36:10 PDT (-0700)

According to North American Mushrooms by O.K. Miller and Hope Miller page 147, this variety “with abnormal lamellae covered with a dense tissue” is called Lentinus tigrinus var squamosus or Lentodium squamulosum Morgan.

Radial lines
By: Paul Derbyshire (Twizzler)
2008-10-14 13:53:38 PDT (-0700)

The veil, or whatever, has radial lines on it, like you might expect if it’s taut against gills. The cut-open one does look odd, but it’s hard to tell for sure. Cutting a section across, rather than along, the “gills” (or whatever) would tell us more, or removing the lowest layer of tissue.

Tough and leathery suggests the possibility of a polypore relative, though I don’t know if any of those have veils.

Third photo shows what may be shallow gills, folds with crossveins, or even angular pores through holes in the veil, if veil it is.

No gills
By: Dan Molter (shroomydan)
2008-10-14 13:36:06 PDT (-0700)

See second photo. There were about 10 of these growing on a single log, and none of them have gills. The flesh is also much tougher than Leucopholiota decorosa.

Gills
By: Paul Derbyshire (Twizzler)
2008-10-14 13:34:26 PDT (-0700)

I think these may be immature, with gills concealed by a fairly thick partial veil. If you still have it, try peeling it back on the one you cut open lengthwise.

Created: 2008-10-14 13:19:33 PDT (-0700)
Last modified: 2014-10-12 09:12:59 PDT (-0700)
Viewed: 1047 times, last viewed: 2016-09-01 09:09:05 PDT (-0700)
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