Dictionary.net

• The layer of dense hyphal threads below the thecium in Lichens; the upper layer of the ascoma.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• [Greek] The layer of dense hyphal threads below the thecium in lichens; upper layer of ascoma.

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth