Schizothyrioma aterrimum (Karsten) Holm, 1971

on Achillea

Schizothyrioma aterrimum: apothecia on Achillea ptarmica

Achillea ptarmica, Belgium, prov. Antwerp, Geel, Wilders, 25.ix.2018 © Carina Van Steenwinkel: apothecia on the leaves (also on the stems)

Schizothyrioma aterrimum: apothecia on Achillea ptarmica

apothecia

Schizothyrioma aterrimum: apothecia on Achillea ptarmica

apothecia (one split open, exposing the layer of asci

Schizothyrioma aterrimum: apothecium

apothecium, squashed

Schizothyrioma aterrimum: asci

asci; the pore at the tip is coloured blue with a jodium solution (lugol), and paraphyses

Schizothyrioma aterrimum: ascus

ascus

Schizothyrioma aterrimum: ascospores

ascospores (in this material 2-2.5(3) x 12-12.5 µm).

gall

shining black, less than a mm long elliptic blisters on the stems and undersides of the leaves. They split open, exposing a reddish- or greyish-brown layer of asci. The asci contain mostly 6-8 spores. Spores hyaline, 1-septate, 2-2.5 x 8-12 µm.

host plants

Asteraceae, narrowly monophagous

Achillea ptarmica.

references

Ellis & Ellis (1997a), Kruse (2014a), Richter (2003a), Roskam (2019a).

mod 19.ix.2019