Observation 181472: Pisolithus Alb. & Schwein.
When: 2014-10-03

Notes: With pine.

Normal shape (flattened hemisphere on top of a frustum tapering downward), plus a big crusty nodule pointing out from the upper area. The nodule interior developed just as if the whole fb had grown out to that width.

Peridium:
- Big smooth tan area above.
- Big yellow area below, when rubbed, easily stains/exposes(?) black. This corresponds to the “blurry brown spots” in obs 178374.

Peridoles:
- Throughout, as the yellow peridioles become more distinct/separable from the jelly, their surface remains yellow, becoming more distinct from the peridiole interior. The surface texture becomes a fine powder.

Stage 1. (1 in obs 180450)
- Black & white mottled mass, white turning to yellow when injured, spots streaking outward.

Stage 2. (2-3 in obs 180450)
- Peridioles are distinct, still with white interiors that turn yellow.
- Peridiole parts with more white left exposed are prone to pink staining.

Stage 3. (4 in obs 180450)
- Yellow peridiole interiors turn blackish.
- This maturation happens more quickly towards the middle of the peridiole.

Stage 4. (between 4 and 5 in obs 180450)
- Blackish peridiole interiors turn dark purplish black.
- This maturation happens more quickly towards the middle of the peridiole.

Stage 5. (between 4 and 5 in obs 180450)
- Dark purplish black interiors turn dark chocolate & somewhat powdery.
- This maturation happens more quickly towards the middle of the peridiole.

Stage 6. (5 in obs 180450)
- Dark chocolate interiors turn lighter chocolate and obviously powdery (full of spores)

Stage 7. (6 in obs 180450)
- Peridiole exteriors & (now dry) jelly fade away with maturity.
- Cottony whisps appear with maturity (from ^?).
- Whisps keep the spore mass vaguely intact, whether or not they’re still contained by the fb peridium.

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Comments

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Peridium disappearing
By: Jacob Kalichman (Pulk)
2014-10-10 01:14:47 CDT (-0500)

Could happen that way.
By: Daniel B. Wheeler (Tuberale)
2014-10-05 17:02:41 CDT (-0500)

And an interesting premise. In my area, peridium gone by the first rainfall. Of course, we have somewhat more rainfall than you most years.

Peridium dissolution & spore release
By: Jacob Kalichman (Pulk)
2014-10-05 13:09:45 CDT (-0500)

I have the impression that that process is gradual, and peridiole expansion with maturity isn’t a big contributor to spore release.

- The peridium can just get thinner and thinner until it disappears, at least in some places. Fading, not tearing. (image 464389, will try to look for more)

- Those cottony wisps hold the spore mass roughly intact even with the peridium gone.

- As the fb gets old, the spore mass on top gets much, much bigger, while the distinctly peridioled area, where their size increases, only does so slowly (image 464402, image 461679, image 449891). So if there’s pressure from the interior, it’s more from the creation of new peridioles, rather than the expansion within them.

I was trying to point out
By: Daniel B. Wheeler (Tuberale)
2014-10-05 07:49:12 CDT (-0500)

that the peridium of Pisolithus is paper thin. If the upper peridioles expand (vs. the apparent size of the lower peridioles) that could cause considerable pressure on the peridium top, leading to a (perhaps) explosive release of spores. Something I have not seen, but which would be interesting to view in time-lapse photography.

The black gell at the base of the fb then seems to be a food-supply, allowing for maturation of the lower peridioles.

Peridiole expansion
By: Jacob Kalichman (Pulk)
2014-10-04 21:43:10 CDT (-0500)

Well, of course each one expands as it matures, they don’t pop out of nowhere at full size… :P

Perhaps the question is, do the peridioles overall expand as the fb matures; i.e., are the peridioles at a given maturity stage larger when the fb is older?

I think the answer is no, at least past some point, because I haven’t seen big peridioles on huge fb’s.

Let me make sure I understand, Jacob.
By: Daniel B. Wheeler (Tuberale)
2014-10-04 20:53:16 CDT (-0500)

When the sporocarp peridioles become mature, they also expand? That would certainly assist with spore dispersal, and maybe peridium disintegration.

Peridiole size increases with “maturity”/“upperness”
By: Jacob Kalichman (Pulk)
2014-10-04 18:27:38 CDT (-0500)

There’s a very obvious sporocarp/host correlation: Eucalyptus ones have ochre spores; others have chocolate spores.

Peridioles
By: Daniel B. Wheeler (Tuberale)
2014-10-04 08:43:27 CDT (-0500)

in the upper half of sporocarp appear larger, Jacob. Are they?

Keep up the excellent notes! No one really knows what will be important and what won’t, really. Size of peridioles (or locules, in Rhizopogon’s case) may help establish some species. It looks like there may be a correlation between host species and sporocarp at least.

Created: 2014-10-03 17:46:48 CDT (-0500)
Last modified: 2014-10-07 18:07:05 CDT (-0500)
Viewed: 101 times, last viewed: 2015-11-09 17:02:05 CST (-0600)
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