Discusses the decocting of "red bark", possibly for agues: [William] Withering uses 'Salix alba', Smith recommends 'Salix myrsinites'. [John] Lightfoot says the 'Fontinalis pennata' Smith found is 'Hypnum complanatum'. Discussion of lichens: does not believe Smith's two 'Lichen parellus' specimens are distinct; agrees with 'L. pertusus'; Smith's 'L. gelidus' accords with Hudson ["Flora Anglica"] but does not think it distinct from 'L. ventosus'; mistakenly called 'L. fluviatilis' 'L. vivularis'; requests 'L. vespertilis', 'L. marginalis', and 'L. sylvaticus'; London botanists wrong about 'L. cristatus' and 'L. crispus', errors with Dillenius' plate of it; requests 'L. vernalis' of Lightfoot and 'L. fernugineus' of Hudson; Lightfoot's 'L. aurantiacus' is Hudson's 'L. ferrugineus' and not 'L. flavo-rubescens'; unsure what Lightfoot's 'L. vernalis' is in Hudson.