Discusses his essay, "De Pisolitho", which he sent for Smith's opinion, and quoting of Scopoli's 'Lycoperdon arrizon' as a synonym for 'Pisolithus arenarius'; proposes naming it 'P. scopolii' [coloured drawing extant]. Apologises for delay in sending promised plates of [Johann Baptist von] Albertini's "Conspectus Fungorum", which his friend Mr Steinhaur will now do. Lists recent fungi he has found: 'Xyloma acerinum', 'Agaricus lactifluus var. deliciosus', 'Clavaria ericelorum', 'C. gyrans', 'Sphaeria militaris', 'Hydnum repandum', 'Peziza papillata', and 'Tremella auriformis'; always uses [Christiaan Hendrik] Persoon's names, despite some of them not seemingly appropriate for the plants they are meant to denominate.

He has minutely examined the fern mentioned in his last letter and concludes it is either new or a new variety, possibly of 'Aspidium spinulosum'. Found a variety of 'Blechnum boreale'; observations. Bolton's discovery of 'Hyminophyllum pyxidifenum'.

Coloured drawing labelled "'Pisolithus arenarius'.