Observation 7484: Agaricus L.

When: 2008-05-09

Collection location: Jalisco, Mexico [Click for map]

Who: Alan Rockefeller (Alan Rockefeller)

No specimen available

The mycelium from these edible Agaricus mushrooms makes the grass grow better by giving it nutrients and water, allowing areas where mycelium is growing to be clearly seen! Mushrooms fruit in fairy rings at the edges of the green circles.

Species Lists


Copyright © 2008 Cactu
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Proposed Names

92% (2)
Recognized by sight
Based on chemical features: Ate them for dinner
47% (5)
Recognized by sight: Looks exactly like meadow mushrooms I have eaten.

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= Observer’s choice
= Current consensus


Add Comment
That makes sense
By: Johannes Harnisch (Johann Harnisch)
2009-04-19 12:08:12 CDT (-0400)

they can be grown on horse manure and hey etc… so they have to be be saprophytic…..
Saprophytic fungi, grow on dead or decaying matter like wood, humus, soil, dung, grass, or compost, they sometimes form fairy rings in lawns or in the woods starting at a certain point and growing outward every year as long as there is an even amount of nutrients, some of these fairy rings are said to be up to six-hundred years old. The Fairy Ring mushroom which often forms fairy rings in lawns, and Shaggy Manes which can also be found in lawns and are often collected for food. These are some examples of saprophytic terrestrial fungi (fungi that grow on the ground). Some fungi in this group are also grown commercially for food.

By: Alan Rockefeller (Alan Rockefeller)
2009-04-17 22:14:47 CDT (-0400)

No, all species of Agaricus are saprophytic.

They are not Mycorhizal with grass right?
By: Johannes Harnisch (Johann Harnisch)
2009-04-17 18:04:58 CDT (-0400)
Mycorrhizal fungi form a symbiotic or mutually beneficial relationship with 80-90% or more of all plants and trees that have a root system; there is about 5,000 mycorrhizal fungi. The mycelium forms a sheath around the rootlets with some hyphae penetrating the roots and can actually live within the rootlets. This complex association of fungi and plants is called mycorrhiza (my’kuh rye’zuh). The rootlets provide the fungus with moisture and organic compounds such as carbohydrates and the fungus by digestion of organic matter in the soil make nitrogen, sugars, phosphorus and other minerals such as copper and zinc, available to be easily absorbed by the plant or tree.

This relationship with the rootlets is said to provide added resistance to diseases, also helping trees to survive in poor or exposed soil.

By: Christian (Christian Schwarz)
2009-04-17 17:26:31 CDT (-0400)

Being able to see the shape of mycelia in a homogenous habitat is REALLY interesting to me.
Surprising that even in this regularized habitat there are contortions to the outline of the mycelium – imagine what their outlines look like in a forest habitat, interrupted by unfavorable host trees, boulders, animal-disturbed soil, etc.

Thanks for posting!
By: ultio1
2009-04-17 15:24:29 CDT (-0400)

Great pictures. Really neat visible demonstration of mycelium pairing up with plants. I have tried to explain it to people so many times and they just look at me like I am crazy. Thanks for posting your observation.

Cool Pictures!
By: Tom Volk (TomVolk)
2008-05-11 13:02:45 CDT (-0400)

hi Alan. great pictures! Sometimes the mycelium competes with the grass for nutrients. I guess it depends on the conditions.