Exobasidium vaccinii (Fuckel) Woronin, 1867

cowberry redleaf, azalea leaf and flower gall

on Vaccinium

Exobasidium vaccinii: galled flower of Vaccinium vitis-idaea

Vaccinium vitis-idaea, France, dép. Haute-Loire, Chanaleilles, mnt La Garde au Truc, 1380 m © Henri Maleysson: at rare occasions also a flower becomes galled

Exobasidium vaccinii: galled flower of Vaccinium vitis-idaea

the calling mainly concerns the peduncle and receptacle.

Exobasidium vaccinii on Vaccinium vitis-idaea

Vaccinium vitis-idaea, estate Tongeren © Hans Jonkman

Exobasidium vaccinii gall

Vaccinium vitis-idaea, Tongeren, het Greveld © Arnold Grosscurt

Exobasidium vaccinii gall

another type of this gall

Exobasidium vaccinii gall

upperside of the same leaf

gall

The spores are slender, curved, up to 19 µm long, septate.

host plants

Ericaceae, narrowly monophagous

Vaccinium vitis-idaea.

Redfern & Shirley associate the fungus also with Empetrum nigrum. Given the extreme monophagy in the genus Exobasidium, this is hard to believe. Perhaps Exobasidium empetri Ito & Otani, 1958 does occur in Scotland?

references

Begorow, Bauer & Oberwinker (2001a), Bellmann (2012a), Blumer (1946a), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Döring (2003a), Doppelbauer (1973a), Ing (1994a, 2001a), Coulianos & Holmåsen (1991a), Klenke & Scholler (2015a), Koops (2013a), Kozłowska, Mułenko & Heluta (2015a), Mervielde (2001a), Pellicier (2001a), Negrean (1996b), Redfern & Shirley (2011a), Roskam (2009a), Schmid-Heckel (1985a), Spooner (1988a), Tomasi (2003a), Woods, Chater, Smith ao (2018a).

mod 8.ii.2019