Plant Parasites of Europe

leafminers, galls and fungi

Melanustilospora ari

Melanustilospora ari (Cooke) Denchev, 2003

on Arum, Biarum

Melanustilospora ari on Arum maculatum

Arum maculatum, Belgium, prov Liège, Kelmis, vallée de la Gueule en amont de Plombières, 17.iv.2022 © Carina Van Steenwinkel

Melanustilospora ari on Arum maculatum

same leaf seen from above, from below, and lighted from behind.

Melanustilospora ari on Arum maculatum

advanced infection

Melanustilospora ari on Arum maculatum

also in the petiole

Melanustilospora ari on Arum maculatum

spore mass in the mesenchym

Melanustilospora ari on Arum maculatum

spores

Melanustilospora ari on Arum maculatum

spores (without the gelatinous mantle) 11-15 x 12-19 µm.

parasite

Relatively extensive, ill-delimited, greyish green leaf spots, not delimited by veins. The infection is inconspicuous, the leaf surface is only lightly swollen. Embedded in the leaf tissue lie masses of roundish, yellow-brown spores with a smooth, double wall of uneven thickness, 13-17 µm in diameter.

host plants

Araceae, oligophagous

Arum besserianum, cylindraceum, elongatum, italicum, maculatum, orientale subsp. danicum; Biarum tenuifolium.

synonyms

Melanotaenium ari.

notes

Plants with blackish swollen spots like in the pictures below, have nothing to do with the fungus and are not pathological at all (verified by Carina).

black

Arum maculatum, Belgium, prov. Namur, Lavaux-Sainte-Anne © Chris Snyers

Melanustilospora ari: galls on Arum maculatum

underside

references

Almaraz (1998a), Buhr (1964b), Denchev (2003a), Klenke & Scholler (2015a), Kruse (2019a), Lotze-Engelhard (2010a), Mayor (1975a), Redfern & Shirley (2011a), Savchenko, Dzyunenko & Heluta (2010a), Savchenko & Heluta (2012a), Scholz & Scholz (2013a), Van Steenwinkel, Fraiture & Vanderweyen (2022b), Tomasi (2014a), Tóth (1994a), Vánky (1994a, 2012a), Vánky, Lutz & Bauer (2008b).

Last modified 20.x.2022