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Geastrum triplex

Posted by
Johan Dierckx (Wijnegem, Belgium) on 28 November 2012 in Plant & Nature and Portfolio.

Geastrum triplex (NL: Gekraagde aardster / EN: Collared earthstar, Saucered earthstar, Triple earthstar / DE: Halskrausen-Erdstern / FR: Géastre à trois couches) is a species of fungi in the Geastraceae family. Discovering a specimen belonging to the genus Geastrum, or earthstar fungi, is always a delight. Immature fruit bodies are almost spherical, resembling puffballs with pointed beaks , and are mostly partially or completely buried in the ground. As the fungus matures, the outer layer of tissue (the exoperidium) splits into four to eight pointed segments which spread outwards and downwards, lifting and exposing the spherical inner spore sac. The spore sac contains gleba, a mass of spores and fertile mycelial tissue that when young is white and firm, but ages to becomes brown and powdery. Often, a layer of the exoperidium splits around the perimeter of the spore sac so that it appears to rest in a collar or saucer.
However, Geastrum triplex doesn't always form a saucer, and other distinguishing features must then be matched for accurate identification: This species is the largest of the earthstar fungi, with a tip to tip length of an expanded mature specimen reaching up to 12 centimeters; the pronounced "beak" on young specimens; the fuzzy opening in the spore case (the "peristome" which is usually surrounded by a paler area); and the fact that the mushroom is attached to the substrate only at the base.

Image: Zoersel (BE) – 30/09/2012

Canon EOS 400D 1/250 second F/5.6 ISO 200 150 mm

© Johan Dierckx

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Aigleloup from Rebecq, Belgium

On dirait une Tentacule ou une Mygale.

28 Nov 2012 9:53am

Canon EOS 400D
1/250 second
ISO 200
150 mm