Samiksha Jaiswal (Editor)

Geastrum

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Kingdom
  
Fungi

Subclass
  
Phallomycetidae

Family
  
Geastraceae

Higher classification
  
Earth stars

Division
  
Basidiomycota

Order
  
Scientific name
  
Geastrum

Rank
  
Genus

Geastrum California Fungi Geastrum saccatum

Lower classifications
  
Geastrum triplex, Geastrum fimbriatum, Geastrum rufescens, Geastrum quadrifidum, Geastrum pectinatum

Geastrum saccatum earthstar puffball


Geastrum (orthographical variant Geaster) is a genus of mushroom in the family Geastraceae. Many species are known commonly as earthstars.

Contents

Geastrum California Fungi Geastrum saccatum

The name comes from geo meaning earth and aster meaning star.

The name refers to the behavior of the outer peridium. At maturity, the outer layer of the fruiting body splits into segments which turn outward creating a star-like pattern on the ground. The inner peridium is a spore sack. In some species, the outer peridium splits from a middle layer, causing the spore sack to arch off the ground. If the outer peridium opens when wet and closes when dry, it is described as hygroscopic.

Geastrum httpsuploadwikimediaorgwikipediacommonsthu

In some species, the inner peridium is borne on a stalk or pedicel. The columella is a column-like clump of sterile tissue to be found inside the inner peridium. The network of fertile tissue inside the inner peridium, the capillitium, arises from the columella. The mouth in most species of "earth-stars" is quite prominent, often arising as a small cone at the apex of the inner peridium. It may be even or sulcate (grooved).

Geastrum Geastrum Wikipedia

They are generally not toxic but considered non-edible due to their fibrous texture in the mature stage that they are generally found at.

Geastrum Geastrum saccatum Wikipedia

Geastrum pectinatum earthstar spore release


Species

Geastrum California Fungi Geastrum saccatum

Although the Dictionary of the Fungi (2008) estimated roughly 50 species in Geastrum, a more recent estimate (2014) suggests that there may be up to 120 species. Some similar species that are otherwise difficult to differentiate using classical morphological features (such as G. triplex, G. saccatum, and G. lageniforme) can be identified using chemical spot tests that detect phenoloxidase enzymatic activity, as well as differences in the crystal structure of calcium oxalate deposits. Species include:

Geastrum California Fungi Geastrum floriforme

References

Geastrum Wikipedia


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