Is it Callistosporium luteo-olivaceum or Callistosporium luteoolivaceum? Index Fungorum says Callistosporium luteo-olivaceum.
nathan 2009-04-27:
I’ve heard (but not verified) that ‘-’s are always optional in the code. However, in this case, the double-o seems pretty awkward, so I’m going with the ‘-’.
Patrick Leacock 2011-12-18:
Yes, the hyphen can be used in this case (but not mandatory).
“The use of a hyphen in a compound epithet is treated as an error to be corrected by deletion of the hyphen, unless the epithet is formed of words that usually stand independently or the letters before and after the hyphen are the same, when a hyphen is permitted.” [Article 60.9. in the International Code of Botanical Nomenclature (VIENNA CODE) 2005]
