Observation 289427: Pisolithus arhizus group

When: 2017-09-05

Collection location: West St. Louis Co., Missouri, USA [Click for map]

Who: Judi T. (AvidAmateur)

No specimen available

Notes:
A trio in various stages of development fruiting in hard packed, poor soil near an in-ground water meter beside a sidewalk in residential area. Nearest tree and shrubbery associates: mature Pin Oak and several Viburnum shrubs. Largest specimen measures 9 cm. X 7 cm. X 6 cm. high. Colorful bands of peridioles. One specimen has started to open through the thin, brittle peridium at the top for spore dispersal. Short rooting base.

Images

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Copyright © 2017 Judi Thomas
Close-up of peridioles
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Copyright © 2017 Judi Thomas
IMG_0783-001.JPG
Copyright © 2017 Judi Thomas
IMG_0846.JPG
Copyright © 2017 Judi Thomas
IMG_0724.JPG
Copyright © 2017 Judi Thomas
In situ
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Copyright © 2017 Judi Thomas
IMG_0729.JPG
Copyright © 2017 Judi Thomas
Peridium starting to open at top for spore dispersal.
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Copyright © 2017 Judi Thomas
Clolse-up of opening in the peridium at top of specimen
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Copyright © 2017 Judi Thomas
IMG_0741.JPG
Copyright © 2017 Judi Thomas
Short rooting base.
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Copyright © 2017 Judi Thomas
Rusty-brown spore dust
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Copyright © 2017 Judi Thomas
KOH after 30 minutes
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Copyright © 2017 Judi Thomas
KOH after 2 hours

Proposed Names

65% (2)
Recognized by sight
Used references: Fungi Magazine, Summer 2017, Vol.10, No. 2 (specimens match the specific color banding of Noah Siegel’s featured centerfold photo), MO observations; Arora’s MD
82% (1)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

Add Comment
Thanks, Sylvia. There’s so much intricate beauty hidden
By: Judi T. (AvidAmateur)
2017-09-07 06:27:16 PDT (-0700)
inside the very bland exterior of this species. Always a fun surprise.
A great find!
By: weed lady (Sylvia )
2017-09-07 03:10:12 PDT (-0700)

and a wonderful observation!

Three images added, showing (1) rusty-brown spore
By: Judi T. (AvidAmateur)
2017-09-06 15:27:11 PDT (-0700)

dust on peridioles, (2) KOH reaction on specimen surface after 30 minutes (reddish-orange) and (3) after 2 hours (reddish-black).