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Chemical Studies in the Genus Lobaria and the Occurrence of a New Tridepside, 4-O-Methylgyrophoric Acid
Chicita F. Culberson
Vol. 72, No. 1 (Spring, 1969), pp. 19-27
Published by: American Bryological and Lichenological Society
Stable URL: http://www.jstor.org/stable/3241351
Page Count: 9
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A new tridepside, 4-O-methylgyrophoric acid, was extracted from a Jamaican collection of Lobaria cfr. dissecta that also contained gyrophoric acid. The structure of the new product was proven by identification of its methyl ester as tenuiorin by direct comparison with a sample of the latter extracted from L. linita. Microchemical studies on 177 herbarium specimens of 18 taxa of Lobaria showed the presence of 4-O-methylgyrophoric acid, either as a constant component or as an accessory but always accompanying gyrophoric acid in L. crassior, L. dentata, L. cfr. dissecta, L. erosa, and L. quercizans. In addition to the tridepsides gyrophoric acid, 4-O-methylgyrophoric acid, and tenuiorin, the following substances were detected: atranorin, constictic acid, norstictic acid, scrobiculin, stictic acid, usnic acid, thelephoric acid, and several unidentified substances.
The Bryologist © 1969 American Bryological and Lichenological Society