Observation 116661: Radiigera Zeller

When: 2012-11-13

Collection location: Bear Trap, Siskiyou County, California, USA [Click for map]

Who: Christian (Christian Schwarz)

No specimen available

Proposed Names

84% (1)
Used references: Key to Spores of the Genera of Hypogeous Fungi of North Temperate Forests with special reference to animal mycophagy, by Castellano, Trappe, Maser and Maser. While capitate columella not visible to me, the space where it would be is clearly visible, and has numerous radiating lines extending from that space toward the peridium. These features visible to me only when the photo is maximized. Spores fall within the range of Radiigera as well.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Just viewed the photo at highest possible size.
By: Daniel B. Wheeler (Tuberale)
2012-11-17 07:42:30 CET (+0100)

Radiating fibers present in gleba, arrising from and radiating outward from the central hole. Additionally, there is a distinctive thin covering of the peridium, especially at the top of the photo.

I think you are correct Christian. This must be Radiigera.

Was the interior just a powdery mass as it appears?
By: Daniel B. Wheeler (Tuberale)
2012-11-17 07:14:12 CET (+0100)

Or did it unfold like an accordion, suddenly, when the sporocarp was cut?

By: Christian (Christian Schwarz)
2012-11-17 02:29:44 CET (+0100)

I meant that the ‘rooting structure’s is not a rooting structure. It is a piece of peridium. The interior texture is unlike any Scleroderma I have ever seen or heard of.
I’ll scope it later.

Rooting structure part of peridium?
By: Daniel B. Wheeler (Tuberale)
2012-11-16 21:12:02 CET (+0100)

Then likely a Scleroderma.

Radiigera has an indented basal attachment, which is also attached to the capitate columella inside the gleba. The capitate columella should look like a small ball and does not extend into the glebal cavity more than 1/2 the total height of the cavity (more commonly 1/3 the total height).

In my experience (I’ve found only 2 Radiigera myself, and observed several others found on forages I was on) the basal attachment tends to stay with the sporocarp. In addition, Radiigera is usually barely epigeous (barely visible above ground) while Scleroderma (except for S. hypogaeum) is mostly epigeous.

Here are some obs. of actual Radiigera: 80685: young specimen; 106994: old specimen.

In Key to the Spores of the Genera of Hypogeous Fungi of North Temperate Forests, the peridium is described as: “… with a thin, felty outer layer over a thick, crisp-fleshy layer…” Usually this felt-like covering of the peridium adhers to soil and humus particles which remain with the sporocarp. I don’t see that layer here.

Radiigera features
By: Christian (Christian Schwarz)
2012-11-16 16:57:36 CET (+0100)

The rooting structure at the base is not a rhizomorph, but a piece of the peridium that detached when I cut it.

The central hollow in the midst of the gleba above the clearly basally indented peridium shows where the capitate central columella was. It is partially covered in spores and gleba in this photo.

The gleba fibers were and I think are visibly radiating outwards from the center of the gleba-hollow (where the columella was) to the inner part of the peridium. I have the specimen and could scope it soon.

Can’t confirm, Christian.
By: Daniel B. Wheeler (Tuberale)
2012-11-16 08:19:33 CET (+0100)

According to Keys to Spores of the Genera of Hypogeous Fungi of North Temperate Forests, (p. 98-99) Radiigera has a “…prominent, soft, capitate, white columella, from which straight hyphae radiate to connect with the peridium.” In Radiigera I’ve found, the columella is distinctive and usually present. Even when the fungus is immature. There should also be “… an indented basal attachment.” While the description does not give it, the accompanying photos show a strong cord-like rooting structure at the base. Remnants of radiating hyphae within the gleba should also be visible, and from which the genus is named. I don’t see them here.

Handkea is similar to Radiigera, lacks a columella, and has a powdery spore mass lacking radiate hyphae.

Can I ask how R. fuscogleba was derived for this obs.? Were spores examined?

BTW, this does not mean I disagree with your identification. Only that I can’t see features that should be present.

Created: 2012-11-14 03:37:10 CET (+0100)
Last modified: 2012-11-17 07:47:27 CET (+0100)
Viewed: 83 times, last viewed: 2018-01-23 21:25:28 CET (+0100)
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