|Title||Lichens of the Mackinac Straits region. I. The Cladonia cariosa group|
|Publication Type||Journal Article|
|Year of Publication||1975|
Culberson (1969) has revised the systematics of some of the members of the Cladonia cariosa group (=Cladonia series Helopodium (Ach.) Matt.) in North America. His study concentrated mainly on the southern species (C. polycarpia Merr., C. polycarpoides Nyl., and C. subcariosa Nyl.) and treated more northern species (C. cariosa (Ach.) Spreng. and C. symphycarpa (Ach.) Fr.) in a more superficial manner. In the course of revising material from the herbarium of the University of Michigan Biological Station, I found two chemical variants not included in Culberson's (1969) treatment. In order to fill in the picture, additional material in the University of Michigan Herbarium and in the Cryptogamic Herbarium of Michigan State University was studied. All of the specimens were analyzed by thin layer chromatography (Eastman silica gel 6060 with fluorescent indicator, benzene: dioxane: acetic acid, 90:25:4).