Scott. Natural. 6: 102 (1881).

Chemistry: (Swinscow & Krog 1988, Hale & Cole 1988, Culberson 1970, Swinscow & Krog 1979 fide Posner 1990: 115)
Race I: Usnic acid, stictic acid agg., norstictic acid.
Race II: Usnic acid, stictic acid agg., norstictic acid, barbatic acid.
Race III: Usnic acid, stictic acid agg., norstictic acid, salazinic acid, barbatic acid.
Race IV: Usnic acid, salazinic acid, norstictic acid, fatty acids.
Race V: Usnic acid, fatty acids.

without mentioning a race: Stictic acid, constictic acid by TLC for Sao Miguel (Sópez de Silanes & Paz Bermudez 2002: 79).