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 roemerianus, 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, P. apicicola appears only in the apices. Both species are exposed to extreme conditions, such as salt spray and rain, freezing in the winter and subtropical summer temperatures, and alternations between wetting and drying. So far, M. eurypotami has been collected in North Carolina and Virginia, and P. apicicola in North Carolina. Mycosphaerella eurypotami is compared with Monascostroma innumerosum and Mycosphaerella juncellina, and P. apicicola with other Paraphaeosphaeria species.