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There's a crop circle in the yard


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...of fungus. It's a circle of black stuff on the leaves of the grass. And it's about a foot wide line and the circle is about 15 feet diameter. The fungus "paints" the grass. I think I've seen mushrooms do this. Now, what I want to know is how does a fungus know how to do this? And why does it do it?

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Assuming these things are similar to fairy rings (which is cuased by a fungus), a spore germinates, consumes the food in that small area, and then grows outward where more food is available.

 

It just so happens that the fungus grows at a rate uniform enough that the growth pattern is rather symetrical.

 

Of course, before it's a ring it's just a spot. and it won't be recognizable as a fairy ring until later in it's life cycle.

 

Hopefully that makes sense. It's just a fungal network looking for food. Obviously there's less food in the territory the network has already covered, so it's slowly growing outward from it's point of origin.

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Originally posted by polyt:

Assuming these things are similar to fairy rings (which is cuased by a fungus), a spore germinates, consumes the food in that small area, and then grows outward where more food is available.

 

It just so happens that the fungus grows at a rate uniform enough that the growth pattern is rather symetrical. Of course, before it's a ring it's just a spot. and it won't be recognizable as a fairy ring until later in it's life cycle. Hopefully that makes sense. It's just a fungal network looking for food. Obviously there's less food in the territory the network has already covered, so it's slowly growing outward from it's point of origin.

Well, there's unaffected grass in the middle. It's like you painted the fungus on, tracing the circumference of the circle. The middle part is normal grass.

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Taking the fairy rings as an example again, what you actually see when you look at a fairy ring is healthier grass surrounding the most active parts of the fungal network, the active part being the leading edge. The fungus is breaking down food, the byproducts of which the grass is able to utilize for its own benefit.

 

The network is still present within the interior of the ring, it's just not as active because it has used up most of the resources.

 

Now what you are seeing on your lawn is probably the "fruiting bodies" of the network - those cells actively reproducing. Reproduction takes resources, so it follows that it will take place where resources are abundant.

 

A mushroom is also a fruiting body. Surrounding a mushroom is a large fungal network directly connected to the mushroom. This network can be several cubic feet or even meters in volume. The network is busy eating, while the mushroom is busy reproducing - producing and releasing spores.

 

Some biologists consider fungal networks to be the largest organisms on the planet, able to spread over several square miles. Followed closely by large aspen groves. Much larger by weight than any of the large mammals

 

Fungus is really quite fascinating.

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It's nothing. Really. You can trust us.

 

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Yeah...probably a faerie ring (the olde spelling). A central mushroom shoots out spores, which grow into little mushrooms...and then the middle one (if it's the right kind) is consumed by aliens, who abduct Khan and make him listen to kOrN cds.
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