The present paper, which is the first of a series of studies on Discomycetes, is concerned with type material of Ascobolus and Saccobolus from Spegazzini's herbarium, deposited at La Plata (LPS). The author is indebted to Dr. J. C. Lindquist, for sending the herbarium specimens on loan. The work for this paper was facilitated by a grant from the Netherlands Organization for the Advancement of Pure Research (Z.W.O.).