Hypogeal
Hypogeal, hypogean, hypogeic and hypogeous are biological terms describing an organism's activity below the soil surface.
In botany, a seed is described as showing hypogeal germination when the cotyledons of the germinating seed remain non-photosynthetic, inside the seed shell, and below ground. The converse, where the cotyledons expand, throw off the seed shell and become photosynthetic above the ground, is epigeal germination.
In water purification works, the hypogeal (or Schmutzdecke) layer is a biological film just below the surface of slow sand filters. It contains microorganisms that remove bacteria and trap contaminant particles.
The terms hypogean and hypogeic are used for fossorial (burrowing) and troglobitic (or stygobitic) cave-living organisms. The opposite terms are epigean and epigeic.
The term hypogeous is used for fungi with underground fruiting bodies - for example, truffles. The opposite term is epigeous.
References
Podcasts:
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by The Who
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by Pete Townshend
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by Who
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by Az
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by Monaco
Happy Jack
by: The WhoHappy Jack wasn't old, but he was a man
He lived in the sand at the Isle of Man
The kids would all sing, he would take the wrong key
So they rode on his head on their furry donkey
The kids couldn't hurt Jack
They tried and tried and tried
They dropped things on his back
And lied and lied and lied and lied and lied
But they couldn't stop Jack, or the waters lapping
And they couldn't prevent Jack from feeling happy
But they couldn't stop Jack, or the waters lapping
And they couldn't prevent Jack from feeling happy
The kids couldn't hurt Jack
They tried and tried and tried
They dropped things on his back
And lied and lied and lied and lied and lied
But they couldn't stop Jack, or the waters lapping
And they couldn't prevent Jack from feeling happy
(I saw ya!)