Dichotomous table for gallers on Koenigia islandica
by Hans Roskam
1a Stem with about 1–5 mm long bulges, 1–2.5 mm thick, irregular tuber- to barrel-like, sometimes distorted, at first lead-grey translucent, with black dusting after rupturing. Microbotryum koenigiae
= The rare ovary smut Microbotryum picaceum with irregular globular to elliptic spores attacks fruits, which are soon destroyed. Wall densely covered with minute punctated warts