Meaning of "f.a." in the species name
"Forma asexualis" as explained in another paper


  The authors favor the use of the expression forma asexualis (f.a.) in the
  description of anamorphic species of the genus
  Cystobasidium and this decision follows the current
  practice of reclassification of asexual yeast taxa (see
  e.g. Lachance 2012; Groenewald and Smith 2013;
  Daniel et al. 2013; Selbmann et al. 2014)
  
  
  Lachance MA (2012) In defense of yeast sexual life cycles: the
  forma asexualis: an informal proposal. Yeast Newslett
  61:24–25