Tomentum
From LIAS Glossary
tomentum (noun,no plural) – a dense, felt-like, downy, lint-like, cobwebby or woolly mat on the upper or lower surface of the thallus (in contrast: a pubescent surface is covered with much finer and extremely short hairs; a villous surface is covered with long, more slender hairs; both are usually not referred to as a tomentum). This is:part of thallus surface.
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