Erysiphe vernalis Karsten, 1873

on Alnus

gall

mycelium cobweb-like on young twigs and female catkins. Cleistothecia with 8-15 asci, containing 8 spores. Appendages few, attached below the equator, 2-5 x the diameter. They are mycelioid, septate, unbranched.

host plants

Betulaceae, monophagous

Alnus incana, viridis.

notes

Scandinavian species (Finland, Sweden).

references

Brandenburger (1985a: 49), Braun (1995a), Braun & Cook (2012a), Klenke &Scholler (2015a), Leysen (2017a).