Mycosphaerella isariphora (Desmazières) Johanson, 1884

on Stellaria

Mycosphaerella isariphora: ascomata on Stellaria holostea

Stellaria holostea, Belgium, prov. Antwerp, Laakdal, Ossenbroeken, 26.i.2020 © Carina Van Steenwinkel: perithecia

Mycosphaerella isariphora: asci

perithecium with asci

Mycosphaerella isariphora: asci

asci

Mycosphaerella isariphora: ascospores

ascospores

Mycosphaerella isariphora: ascospores

ascospores

Phacellium episphaerium

same material, a few days later

Phacellium episphaerium

bundle of sterile hyphae

Phacellium episphaerium

Phacellium episphaerium

Mycosphaerella isariphora: ascomata on Stellaria holostea

detail

parasite

Ascosporen hyalien, 1-septate, 3-4 x 10-14 µm.

host plants

Caryophyllaceae, monophagous

Stellaria holostea, media.

distribution within Europe

(PESI, 2020).

synonyms

Mycosphaerella isariophora: Ellis & Ellis.

notes

The observation that from material of Mycosphaerella isariphora after a short while Phacellium episphaerium developed is in indication at the latter is the anamorph of the first one. This agrees with the observation by Mułenko & Kozłowska, who frequently found both taxa together, “even even at the same sites, causing combined infections”. It is commonly assumed that Mycosphaerella isariphora is the teleomorph of Septoria stellariae, but that assumption is doubted by Verkley ao.

references

Ellis & Ellis (1997a), Mułenko & Kozłowska (2010a), Verkley, Quaedvlieg, Shin ao (2013a)

mod 26.ii.2020