Apologises that if in calling on Smith he intruded on his time. Sends specimen of 'Erineum acerinum' in earlier state than Smith currently has it; observations. Offers Smith use of his manuscript, in which he intends to give at least a figure for one species of every genus of fungi. Suggests alteration to [Christiaan Hendrik] Persoon's character of 'Erineum acerinum'.

["Spec. 21" written in pencil at top of verso of first folio]