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Armillaria ostoyae

Posted by
Johan Dierckx (Wijnegem, Belgium) on 3 February 2012 in Plant & Nature and Portfolio.

Subtitle: "The meeting-point"

Armillaria ostoyae (syn: Armillaria solidipes ?) (NL: Sombere honingzwam / EN: / DE: Dunkle Hallimasch / FR: Armillaire d'Ostoya) is a species of fungus in the Physalacriaceae family that parasitizes trees across the northern hemisphere.. It is known to be one of the largest living organisms, where scientists have estimated a single specimen found in Malheur National Forest in Oregon to have been growing for some 2,400 years, covering 3.4 square miles. Armillaria ostoyae grows and spreads primarily underground and the bulk of the organism lies in the ground, out of sight. Therefore, the organism is not visible to anyone viewing from the surface. It is only in the autumn when this organism will bloom “honey mushrooms”, visible evidence of the organism lying beneath. Low competition for land and nutrients have allowed this organism to grow so huge; it possibly covers more geographical area than any other living organism. The mycelium of the fungus attacks the sapwood of nearby growing trees and is able to travel great distances under the bark or between trees in the form of black rhizomorphs. These rhizomorphs allow the fungus to obtain nutrients from long distances away.

Image: Ranst (BE) - 02/11/2011

Canon EOS 400D 1/30 second F/5.6 ISO 200 150 mm

© Johan Dierckx

The photos on this site are copyrighted, which prohibits anyone to use them to sell, give away, use in email or newsgroups, use in a homepage or otherwise showing to the public without my explicit, prior, written permission. Please feel free to use the "contact"-button below to contact me with any questions.

All species are photographed in their natural habitat, without cutting or capturing them, and with maximal respect and the least possible disturbance to the environment.

(To see species in the same taxonomic rank (Kingdom, Phylum, Class, Order, Family, Genus), please use the tags provided with the image. The last tag is the Iso-code for the country where the image was taken. Image-date in DD/MM/YYYY format.)

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Corné from Zwolle, Netherlands


Zoals altijd heel fraai. Waar haal je ze vandaan. Bij ons stonden dit jaar zo weinig paddenstoelen.

3 Feb 2012 10:37am

@Corné: Dank je, Corné. Hier was het paddenstoelenseizoen ook erg wisselvallig: vroeg begonnen in augustus, stilgevallen daarna en weer op gang gekomen eind oktober. De grote hoeveelheden heb ik ook niet echt gevonden, maar toch wel altijd iets gezien wat de moeite waard was om op foto te zetten. (En zo blijft er ook nog iets over om volgend jaar weer naar uit te kijken ...) Groetjes !

christine from oelegem, Belgium

Dit duo komt me erg bekend voor :o). Subtiele houding, inderdaad: waar haal je ze vandaan?

3 Feb 2012 2:26pm

@christine: Deze "flirters in het bos" zijn inderdaad al een stapje verder... ach het is ze van harte gegund toch op hun al wat oudere dag :-)))

Canon EOS 400D
1/30 second
ISO 200
150 mm