Ustilago bulgarica Bubák, 1910
All fruits in the inflorescence modifies into a pear-shaped, up to 5 mm large gall., that initially is covered by a greyish-brown membrane. No columella. Spores 5-7 µm, finely spinulose, mixed with 10-18 µm long sterile cells.
Questionable species, possibly a hybrid, known from but on locality (Bulgaria).
Klenke & Scholler (2015a), Vánky (1994a).