Aptroot, A. & F. Schumm 2011: Fruticose Roccellaceae - an anatomical-microscopical atlas and guide with a worldwide key and further notes on some crustose Roccellaceae or similar lichens.. - Soest, The Netherlands ; Wangen, Germany : The authors.. 375 pages pp. [RLL List # 223 / Rec.# 32812] Abstract: [New species: Roccella sanctae-helenae Aptroot & Schumm; new combination: Rocellina arboricol Follmann) Aptroot & Schumm.]
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