LITERATURE CITED
- Asahina, Y., and Y. Sakurai. 1937. Untersuchungen über Flechtenstoffe. LXXIII. Mitteil.: Synthese des Squamatsäure-dimethylesters. Chem. Ber. 70: 64–66.
- Asahina, Y., and Y. Sakurai, and Y. Tanase. 1937. Untersuchungen über Flechtenstoffe. LXXII. Mitteil.: Über die Konstitution der Squamatsäure. Chem. Ber. 70: 62–63.
- Brodo, I. W., and W. L. Culberson. 1986. Haematomma pustulatum sp. nov. (Ascomycotina, Haematommataceae): a common, widespread, sterile liehen of eastern North America. Bryologist (in press).
- Culberson, C. F., and K. Ammann. 1979. Standardmethode zur Dünnschichtchromatographie von Flechtensubstanzen. Herzogia 5: 1–24.
- Culberson, C. F., and K. Ammann, M. E. Hale, Jr., T. Tønsberg, and A. Johnson. 1984. New depsides from Dimelaena oreina and Fuscidea viridis. Mycologia 76: 148–160.
- Culberson, C. F., and K. Ammann, M. E. Hale, Jr., T. Tønsberg, and A. Johnson, and A. Johnson. 1982. Substitution of methyl tert.-butyl ether for diethyl ether in the standardized thin-layer chromatographic method for lichen products. J. Chromatogr. 238: 483–487.
- Culberson, W. L. 1963. A summary of the lichen genus Haematomma in North America. Bryologist 66: 224–236.
- Culberson, W. L.. 1972. Disjunctive distributions in the lichenforming fungi. Ann. Missouri Bot. Gard. 59: 165–173.
- Culberson, W. L., and C. F. Culberson. 1970. A phylogenetic view of chemical evolution in the lichens. Bryologist 73: 1–31.
- Culberson, W. L., and C. F. Culberson. 1978. Cetrelia cetrarioides and C. monachorum (Parmeliaceae) in the New World. Bryologist 81: 517–523.
- Hafellner, J. 1984. Studien in Richtung einer natürlichen Gliederung der Sammelfamilien Lecanoraceae und Lecideaceae. Beih. Nova Hedwigia 79: 241–371.
- Robertson, A., and R. J. Stephenson. 1932. Lichen acids. Part III. The constitution of barbatic acid and the synthesis of isorhizonic acid and methyl barbatate. J. Chem. Soc. 1932: 1675–1681.