Fungi on Juncus roemerianus 12. two new species of Mycosphaerella and Paraphaeosphaeria (Ascomycotina).

Mycosphaerella eurypotami sp. nov. and Paraphaeosphaeria apicicola sp. nov. are described from senescent leaves of the endemic needlerush, Juncus roem erianus, an estuarine plant of the U. S. east coast and the Gulf of Mexico. Whereas M. eurypotami fruits in the middle and tip of the leaves, II apici cola appears only in the apices. Both species are exposed to extreme condit ions, such as salt spray and rain, freezing in the winter and subtropical s ummer temperatures, and alternations between wetting and drying. So far, M. eurypotami has been collected in North Carolina and Virginia, and II apici cola in North Carolina. Mycosphaerella eurypotami is compared with Monascos troma innumerosum and Mycosphaerella juncellina, and P. apicicola with othe r Paraphaeosphaeria species.