E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Common Name: Treeflute Lichens. Describes the hollow lobes and perforated upper surface characteristic of this genus.
Small to medium stratified foliose lichens, corticate above and below, sorediate (in BC), lobes rather closely appressed, hollow, averaging to 1–2 mm wide. Upper surface pale greyish, perforate. Lower surface black, shiny, wrinkled, lacking rhizines. Medulla white. Photobiont green.
Apothecia unknown in the B.C. material.
Over deciduous trees.
Notes: Menegazzia, with approximately 30 species worldwide, is primarily a genus of temperate latitudes in the southern hemisphere; only one species occurs in North America.

Reactions:
Cortex K+ yellow; medulla K+ yellow, PD+ slowly orange.

Contents:
Atranorin, constictic and stictic acid.