Observation 161937: Hymenogaster Vittad.

When: 2014-03-22

Collection location: Braga, Portugal [Click for map]

Who: Elsa (pinknailsgirl)

No specimen available

On my backyard, under Corylus avellana.

Species Lists


2nd “pea” 24/3
2nd “pea” 24/3
2nd “pea” 24/3

Proposed Names

47% (2)
Recognized by sight
Used references: Arora, Mushrooms Demystified; NATS Field Guide to Selected North American Truffles and Truffle-like Fungi.
29% (1)
Recognized by sight
Used references: Identification key to Hymenogaster – Figshare pdf – files.figshare.com/401754/File_S1.pdf
29% (1)
Recognized by sight:
Octavianina asterosperma
29% (1)
Recognized by sight:
Octavianina asterosperma

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
By: Daniel B. Wheeler (Tuberale)
2014-03-30 07:02:02 PDT (-0700)

can stain where bruised. So can Hymenogaster. I’d say it’s about 50/50 one or the other.

Gymnomyces often has sweet or pleasant aromas; Hymenogaster usually unpleasant or gaseous.

Needs microscope photos to be more exact. Keep looking.

Thanks Daniel
By: Elsa (pinknailsgirl)
2014-03-24 10:42:52 PDT (-0700)

The peridium is cracked probably due to my fingers pressure, I think that they are the same fungi, one older than the other. I kept the idea that gleba is initially white/yellow (I saw a little yellow spot on this last specimen) than brownish grey and finally dark brown. I tried to bruise it, with no results, peridium skin is very thin and fragile.

By: Daniel B. Wheeler (Tuberale)
2014-03-24 10:11:58 PDT (-0700)

is still possible, Elsa. I have almost no experience with Corylus avellana, which is not native to Oregon and is found only as host plants for Tuber melanosporum at this time. Similarities remain for Corylus cornuta var. californica, which is prolific in my area and supports many hypogeous genera.

Good news! If in your backyard, you are likely to find it several times in the future.

Sporocarp looks loculate; locules quite large. May need an expert in hypogeous fungi from Europe to set this straight.

Peridium of second fungus appears to be cracking. There is also a sterile base in the first fungus found, but barely more than a pad of tissue. Peridium on first fungus appears bruised to my eye, perhaps from handling (fingernail?). Second fungus does not appear to be bruised, nor does it have that basal pad of tissue. So … could be two separate species.

I found another
By: Elsa (pinknailsgirl)
2014-03-24 07:40:18 PDT (-0700)

“pea”. Same as the other, younger I think. Smell it’s not strong… I’m still thinking on it…something (oily?)+ onion/garlic resemblance.

That’s what I thought
By: Elsa (pinknailsgirl)
2014-03-24 06:08:16 PDT (-0700)

Thank you Daniel, I was waiting for your comments. The specimen doesn’t have any particular smell, is near soil surface (not too buried). Peridium with a base, without rhizomorphs,smooth, with shades of brown and white. Gleba is dark brown with some opening chambers as seen on 2nd photo. Very small, ±0.5 cm. Didn’t notice any change of colour on bruising of peridium, but the specimen could be not so young.

I thought also on Hymenogaster, Protoglossum niveum and Gymnomyces xanthosporus.
I found this site https://sites.google.com/... , and associated with Corylus I only find Hymenogaster luteus which seems to be different. P. niveum keeps its white color for a long time, so it’s a bit apart. I looked for G. xanthosporus description and found this: http://www.mycobank.org/...

What do you think? Do you have any literature associated with Hymenogaster on Corylus avellana?

Absence of rhizomorphs
By: Daniel B. Wheeler (Tuberale)
2014-03-24 00:08:20 PDT (-0700)

precludes Rhizopogon. Not Tuber either, as no venae externae nor venae internae.

Was there a distinctive odor associated with the specimen? Something nearly gaseous?

Interior photos show two difference colors. Second photo shows interior with light brown interior. Third photo shows nearly black interior.

If interior blackish, combined with apparent black staining peridium, I’d suggest Hymenogaster species.

Created: 2014-03-22 15:09:24 PDT (-0700)
Last modified: 2019-12-21 11:01:28 PST (-0800)
Viewed: 91 times, last viewed: 2019-12-21 11:35:46 PST (-0800)
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