
The hypothallus is a hat-like layer on true slime molds, the myxogastria, on which the fruit body is sitting and which displays the connection of the fruit body to the underground. Roughly translated it means `under the thallus`. The hypothallus is produced by the plasmodium at the beginning of the fructification. Depending on the species, it ca.....
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http://en.wikipedia.org/wiki/Hypothallus

(from the article `fungus`) ...that it usually cannot be removed intact. Some crustose lichens grow beneath the surface of bark or rock so that only their fruiting structures ...
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http://www.britannica.com/eb/a-z/h/92

a layer of hyphae rimming the thallus of certain lichens. · a filmlike residue at the base of the sporangia of certain slime molds.
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https://www.infoplease.com/dictionary/hypothallus
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