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 OLD_NEWBIE
journeyman
Registered: 10/12/01
Posts: 65
Last seen: 22 years, 8 months
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 What is overlay?. 
#521336 - 01/15/02 07:09 AM (23 years, 7 days ago) |
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Hello Everybody,
I've done just about all the reading i could but keep cumming accross the word "OVERLAY". My problem is i can't find a meaning for this word. So what is overlay?, Please help.
Thanks all.
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Mitchnast
Toadmonger
 
Registered: 10/27/99
Posts: 8,658
Loc: Okanagan
Last seen: 11 days, 17 hours
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 Re: What is overlay?. [Re: OLD_NEWBIE]
#521338 - 01/15/02 07:14 AM (23 years, 7 days ago) |
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whats the meaning of the word? hmm, well, its a cover, and sort of self-explanitory. its of germanic origin with "over" from the root "uber" meant over... and Lay from Lie meaning to lay.
so its anything that covers up something, in mushroom cultivation it means the mycelium that emerges through a casing and "overlays" the substrate :)
another example of overlay could be snow or volcanic ash
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 dimitri211
Carpal Tunnel
Registered: 04/27/01
Posts: 2,248
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Re: What is overlay?. [Re: OLD_NEWBIE]
#521392 - 01/15/02 03:39 PM (23 years, 7 days ago) |
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Overlay is the condition which results when mycelium has been allowed to completely cover the casing surface. It is caused by prolonged vegetative growth temperatures, high CO2 levels, and excessive humidity. If overwatered, the overlay will become matted, or, will form a dense, dead layer of cells on the casing surface.
A casing showing signs of overlay will begin to shrink and pull away from the sides of the container. It will also become unreceptive to water, and puddles may form on the surface after misting. If any pinheads form, they will likely do so at the edges of the casing. Most of the pinheads will abort, and only a few mushrooms will fully mature. Once this has happened, the casing layer really isn't a casing layer anymore. It is no longer serving it's three main functions, and has in essence become a second layer of non-nutritious substrate.
Thanx Ralph
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,168
Loc: my room
Last seen: 5 days, 5 hours
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Re: What is overlay?. [Re: dimitri211]  1
#521856 - 01/15/02 11:51 PM (23 years, 6 days ago) |
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>and excessive humidity. If overwatered, the overlay will
>become matted, or, will form a dense, dead layer of cells on
>the casing surface.
According to Paul Stamets it?s caused by a too dry casing, not by too wet.
Quote:
"Overlay is a dense mycelial growth that covers the casing surface and shows little or no inclination to form pinheads. Overlay directly results from a dry casing, high levels of carbon dioxide and/or low humidity. "
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darkestmage
Medical Student / Ski Bum
Registered: 06/18/09
Posts: 195
Last seen: 11 years, 4 months
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Re: What is overlay?. [Re: Mitchnast]
#11161929 - 10/01/09 02:39 AM (15 years, 3 months ago) |
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Quote:
Mitchnast said:
whats the meaning of the word? hmm, well, its a cover, and sort of self-explanitory. its of germanic origin with "over" from the root "uber" meant over... and Lay from Lie meaning to lay.
<br>so its anything that covers up something, in mushroom cultivation it means the mycelium that emerges through a casing and "overlays" the substrate 
<br>another example of overlay could be snow or volcanic ash
aka i have no idea what it is, either.
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Nibin
Getting there
Registered: 11/29/05
Posts: 4,480
Last seen: 11 years, 8 months
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Newcomers guide-----> For all things shroomy
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veda_sticks
Cultivator
Registered: 07/29/07
Posts: 14,191
Loc: UK 
Last seen: 5 years, 14 days
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Re: What is overlay?. [Re: Nibin]
#11162154 - 10/01/09 05:06 AM (15 years, 3 months ago) |
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overlay - a condition of casing layers that too many people worry about and too many post "overlay!!!HELP! and that should be banished from the forums.
Too many people think overlay is a heavily colinised casing layer, which it isnt.
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SpearCaps
On a journey
Registered: 11/18/19
Posts: 110
Last seen: 4 years, 9 months
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Any chance there has been a consensus reached what causes overlay (and how to prevent it?)
Chose this thread as it contains two nice but opposing definitions:
a) too much CO2 (both agree)
b) too much water (RR's opinion)
c) too dry (another opinion.
Maybe it is a mix of b) and c), like too dry followed by too moist?
Quote:
dimitri211 said:
Overlay is the condition which results when mycelium has been allowed to completely cover the casing surface. It is caused by prolonged vegetative growth temperatures, high CO2 levels, and excessive humidity. If overwatered, the overlay will become matted, or, will form a dense, dead layer of cells on the casing surface.
<br>
<br>A casing showing signs of overlay will begin to shrink and pull away from the sides of the container. It will also become unreceptive to water, and puddles may form on the surface after misting. If any pinheads form, they will likely do so at the edges of the casing. Most of the pinheads will abort, and only a few mushrooms will fully mature. Once this has happened, the casing layer really isn't a casing layer anymore. It is no longer serving it's three main functions, and has in essence become a second layer of non-nutritious substrate.
<br>
<br>Thanx Ralph
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Outside of right and wrong is a place. There we'll meet.
- Sufi Wisdom
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cronicr 
Registered: 08/07/11
Posts: 62,905
Loc: Van Isle 
Last seen: 1 hour, 14 minutes
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 This thread has been closed.
Reason:
Overlay happens to casing layers in certain species not including cubensis but rather species that actually require a casing layer
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