Fig. 2 in Evaluation of traditionally circumscribed species in the lichen-forming genus Usnea, section Usnea (Parmeliaceae, Ascomycota) using a six-locus dataset

Fig. 2 Box plots of cortex (a, d) and medulla (b, e) thickness measurements and bar charts of medulla density categories (c, f) in clades barbata-chaetophora-dasopoga-diplotypus (bar-das-dip) and barbata-intermedia-lapponica-substerilis (bar-int-lap; first row of charts), and between Usnea barbata specimens from these clades (second row of charts). Box plots show the percentages of the whole width of the measured branch. Center lines are the medians, box limits indicate the 25th and 75th percentiles as determined by R software, whiskers extend