12 species of lichenicolous deuteromycetes are recorded from the weste
rn Pyrenees. 4 species are described as new: Hainesia pertusariae Etay
o & Diederich (on Pertusaria sp.), Macrophomina pseudeverniae Etayo &
Diederich (on Pseudevernia furfuracea), Milospium lacoizquetae Etayo &
Diederich (on Cladonia parasitica) and Sclerococcum parmeliae Etayo &
Diederich (on Parmelia s. l.). The genus Marchandiomyces is recognize
d to include at least two species: M. corallinus (Roberge) Diederich &
D. Hawksw. with pinkish, initially immersed conidiomata, and M. auran
tiacus (Lasch) Diederich & Etayo comb. nov., with orange, more or less
superficial conidiomata.