Two fascicles sent to Carl Linnaeus by Frédéric-Louis Allamand, and the folder in which the fascicles were kept.
Fascicle 1 contains a full title page ('Friderici Allamand | Genera | Plantarum Americanarum | nova 30 | eorumque | characteres naturales | et | species .37.'), a letter from Allamand to Linnaeus (on the verso of the title page), and 'Species Generum Novorum'; fascicle 2 contains 'Genera Nova'.
See Frédéric Allamand to Carl Linnaeus, 3 November 1770 n.s., "The Linnaean correspondence", linnaeus.c18.net, letter L4424. The Linnean Correspondence project gives the following summary to the letter:
'Frédéric Allamand wants to inform Linnaeus on the observations he made on new plants in America during a journey long ago. He had kept the material carefully, but he had lost it when being attacked by pirates. What he now has is the result of two years’ work after he had returned to America, mainly staying in Surinam, a region that had not been covered by any able botanist. So Linnaeus should regard the attached manuscript as a specimen, and Linnaeus should tell Allamand if it is of any worth and also what else Linnaeus may wish. Allamand will follow Linnaeus’s advice.
As an attachment, Allamand sends his “Genera plantarum Americanarum” [the manuscript was never published], twelve leaves containing characters of 37 species.'