<Emphasis Type="Italic">Kretzschmaria varians</Emphasis> sp. nov., <Emphasis Type="Italic">Xylaria coremiifera</Emphasis> sp. nov. and <Emphasis Type="Italic">Xylaria umbonata</Emphasis> sp. nov. from Costa Rica

Kretzschmaria varians, a species apparently related to K. micropus, is described as new. It is distinguished primarily by having asci with 2 to 8 ascospores with inconstant germination slit length and remains of synnemata on stromata and surrounding substrate. Xylaria coremiifera, described here as new, bears small fragile coremia on pulvinate stromata and the surrounding substrate. Asci often have fewer than 8 ascospores, most frequently 4. Xylaria umbonata, described here as new, produces perithecia around a central umbo that appears to be the remains of a synnema. Ascospores have long spiralling germination slits.