Definitions

1. noun

A ridge of tissue that connects two or more parts of a plant or fungus, such as the connection between the thallus and the sporophyte in a fern or the connection between the thallus and the holdfast in a marine algae.

“The hypothallus of the fern played a crucial role in its reproduction process.”

2. noun

The tissue or structure connecting the thallus of a fungus to its substrate.

“The hypothallus allowed the fungus to firmly attach to the tree trunk.”