Thanks for 'Jungermanniae' specimens from "that wonderfully promising young naturalist" [William Jackson] Hooker. Recommends Smith avoid anything that will "keep up or awaken the gall [...] of that worthless wasp" [Richard] Salisbury.

Clarifies that his comment about [James] Hoy's 'Ossigrapha' being more like figures of Hoffmann's 'Verrucaria purpurascens' than any other he could find; different from [Dawson] Turner's 'calcarea'. Turner has requested specimens of 'Fucus brodieii'; encloses some for Smith. Sent [Samuel] Goodenough specimens of 'Fucus brodieii' and 'F. lycopodioides'; Goodenough anxious to establish his varities of 'F. tetragonus' and 'F. escutentus'. Received new specimens from [George] Don, expects he will send to Smith as well, listed, with observations: 'Orbus', 'Lychris alpina', 'Myosotis nana' or 'M. lappula', 'Silene alpestre', 'Epilobium montanum', 'Hypericum barbatum', 'Erigerum uniflorum', 'Veronica allionii', 'Viola lutea', 'Hieracium alpinum' or 'H. villosum', and variety of 'Lamium amplixicaule'.