COSTA RICAN AGARICACEAE Carroll W. Dodge The first collection of Costa Rican Agaricaceae of which records have survived, was that of Anders S. Oersted who visited Costa Rica, Nicaragua and the Virgin Islands in 1846-1848.* -------- Oersted, Anders S. 1851. En reise i Guanacaste. Tidskr. f. populaer Naturvidenskab 1:21-35. 1 map. 1851. --------. 1851. Naturens Physiognomie i Central America. Ibid. 1:255- 283. -------- Upon his return to Denmark, he apparently turned over his collections and a duplicate set of water-color paintings to Elias Fries for naming, since the form the greater part of the Agaricaceae treated in his "Novae Symbolae Mycologicae published in 1851. No specimens have survived at Uppsala, although Fries mentions alcoholic material in alcohol. The collection of drawings, mostly on sheets x cm, usually with Agaricus and a number written across the top in what may be Oersted's handwriting. The number corresponds to that cited by Fries. Below the drawing, the name given by Fries appears, usually in a handwriting apparently that of Fries in his later years. At the bottom of the sheets are the data: Costa Rica. A.S.Oersted in the handwriting of T. M. Fries. This latter was probably added when the collection was tistributed in the general Friesian collection of drawings which were arranged by genera in port- folios in the early 1880's. Since many of the species cited are not from Costa Rica, the data given in the Novae Symbolae should be considered correct and not the locality given on the sheet. All of the species but one in which Fries mentions a drawing are present, along wiht some drawings of some fungi which are not determinable in the absence of specimens.