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Culberson, CF/ Culberson, WL/ Johnson, A 1993: Occurrence and histological distribution of usnic acid in the Ramalina siliquosa species complex. - The Bryologist 96(2): 181-184. [RLL List # 152 / Rec.# 3739]
Keywords: CHEMISTRY/ HISTOLOGICAL DISTRIBUTION/ HISTOLOGY/ RAMALINA
Abstract: 3 fig. 1 tab. ["Usnic acid appears to be a constant secondary product of all chemotypes of the Ramalina siliquosa species complex. Its highly variable concentrations and apparent absence from some individuals are due to a preferential accumulation in apothecia and spermagonia, structures not necessarily included equally in all samples in routine chemical screenings."]

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