The Italian mycologist Giacomo Bresadola (1847-1929) is one of the grand old men of mycology, and his Iconographia Mycologica must be considered as one of the most important iconographies of this century. Bresadola also preserved many of his collections and it is therefore no wonder that his herbarium is very important too. After the first World War, in 1919, Bresadola was forced-for economic reasons-to sell his private herbarium to Stockholm. In 1924 Bresadola sold another part of his collection to the herbarium in Washington. Important Bresadolian collections are also found in Munich. Stafleu and Cowan (1976) remark that the location of his original herbarium is unknown. Conspicuously lacking in this list is the herbarium of the Museo Tridentino di Scienze Naturali at Trento (TR), where Bresadola spent the last years of his life. Dallafiore (1954) indicated the presence of Bresadolian specimens at TR. Unfortunately, this publication appeared in a periodical with a very limited distribution and for that reason the mycological community did not notice this important note. It seems that even the Italian mycologists forgot the existence of these important exsiccates. It was therefore a genuine rediscovery when Bellu and Donini (1986) published a paper on the rediscovery of Bresadola's herbarium at TR. This paper, too, was written in Italian, but its contents seem so important that a short note in Taxon also seems in order. The herbarium is fairly large, containing some 5000-6000 exsiccates. Although this is less than the number of exsiccates preserved in S (some 25,000 exsiccates), many species that Bresadola described during the later years of his life, and illustrated in the Iconographia Mycologica, are only represented there. There are also collections that Bresadola must have kept for reference when he sold the larger part of his herbarium. There are several type specimens too (cf. Moser, 1986; Kuyper, 1990). In addition to these collections from northern Italy, the herbarium might be most important for its collections of polyporaceous fungi, both from temperate regions and the tropics. These collections were made by contemporaries of Bresadola, with whom Bresadola had extensive contacts, and include mycologists such as Lloyd, Murrill, Atkinson, Spegazzini, Sydow, Bondartsev, Bourdot, Galzin, Beccari, and Cleland. The exsiccates are in an excellent state, as they have been always preserved in a dry attic. Unfortunately, there is no (mycological) curator at TR, and it is as yet impossible to obtain collections on loan. The herbarium is now kept in order by Dr. M. Donini, who works at the museum as a volunteer, and by Dr. F. Bellii. A complete list of collections is now being processed. Mycologists interested in these collections should contact Dr. M. Donini, Corso Alpini 15/i, 1-38100 Trento, Italy.