Torrubiella dimorpha sp, nov, on an infected spider from Taiwan is des
cribed and illustrated. It is characterized by producing perithecia on
an orange white, pulvinate, lanose mycelial mat covering the host. Th
e anamorph, Gibellula dimorpha sp. nov., produces gibelluloid and gran
ulomoid synanamorphs on aspergillate, distinctly roughened or warty co
nidiophores, or sometimes produces both synanamorphs on the same asper
gillate vesicle. The differences between T. dimorpha and the closely r
elated T. globosa, T. globoso-stipitata, T. arachnophila, T. ratticaud
ata and T. clavata are briefly discussed.