Lichens of the Mackinac Straits region. II. Candelariella Mull. Arg

TitleLichens of the Mackinac Straits region. II. Candelariella Mull. Arg
Publication TypeJournal Article
Year of Publication1978
AuthorsHarris RC, Buck WR
JournalMichigan Botanist

Candelariella is characterized by bright-yellow apothecia and by a bright-yellow crustose or indistinct thallus. The apothecia are lecanorine, and the spores are simple or 2-celled, 8-many/ascus. The primary yellow pigment is calycin which is KOH-. (Superficially similar birght-yellow species of Caloplaca are KOH+ purple). Candelariella is the largest genus of the Candelariaceae, containing approximately 40 species (Poelt in Hale & Ahmadjian, 1974). Four species are known to occur in Michigan. In the process of reviewing the genus in the Straits region it became obvious that one of the four had previously been neither distinguished nor described. Most often it has been confused with C. xanthostigma (Ach.) Lett. and also with Candelaria concolor var. effusa (Tuck.) Merr. & Burnh. or, when exceptionally well developed, with Lepraria candelaris (L.) Fr. s. lat. This new species is characterized by its sorediate thallus and by polysporous asci.