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Abstract
Two species of Nitschkia are described from bark and wood of a legume shrub, native to the semiarid regions of Argentina. Nitschkia campylospora is characterized by asci with a variable number of ascospores, mainly 16, and curved ascospores; hairy ascomata and large ascospores are two distinct features of Nitschkia pilosa. The new species are compared with most similar species. A key to Nitschkia species is provided with the inclusion of comments on those from Argentina and neighboring countries.
This work was supported by grants from CONICET (PIP 949/98) and UNS (PGI 425/01). Dr Fernando Fernández and Dr Freda Anderson are greatly acknowledged for reviewing the manuscript. Dr Andrea Romero is warmly thanked for her valuable suggestions on N. pilosa. M.V. Sanchez Puerta, Dr Joanne E. Taylor, Dr Michael Vincent and Dr Laura Lorenzo are thanked for providing some of the cited papers. Lic. Marta Garelli is acknowledged for her help with Latin diagnosis. MVB is researcher from the National Research Council from Argentina (CONICET).