Golovinomyces asperifoliorum (Gréville) Braun & Shin, 2018

on Pulmonaria, Symphytum

Golovinomyces asperifoliorum on Symphytum offocinale

Symphytum officinale, Nieuwendam

Golovinomyces asperifoliorum: powdery mildew on Pulmonaria

Pulmonaria officinalis, Dronten © Arnold Grosscurt: the damage to the plant can be considerable

Golovinomyces asperifoliorum: cleistothecia

Symphytum officinale, Nieuwendam: young and old cleistothecia

Golovinomyces asperifoliorum: germinating conidium

germinating conidium

Golovinomyces asperifoliorum

upper cleistothecium and asci: Golovinomyces cynoglossi; lower cleistothecium, conidiophore, conidia and appressoria: G. asperifoliorum (fig. 333 from Braun & Cook, 2012a).

parasite

mycelium conspicuous, white, amphigenous, generally persistent. Conidia in chains, elliptic, without fibrosin bodies, Conidiophores rather short, 80–165 mm long; basal septum at the junction with the mother cell not or at most 5 µm elevated. Cleistothecia with 5-20 asci that contain 2 (rarely 3) spores. Appendages numerous, attached on and below the equator. They are up to 2 x as long as the diameter, flaccid, hyaline, septate, generally unbranched.

host plants

Boraginaceae, narrowly oligophagous

Pulmonaria affinis, angustifolia, dacica, longifolia, mollis, montana, obscura, officinalis, rubra, saccharata; Symphytum asperum, bulbosum, caucasicum, cordatum, grandiflorum, ibericum, officinale & subsp. uliginosum, orientale, ottomanum, tauricum, tuberosum & subsp. angustifolium, x uplandicum.

notes

See the note about the Golovinomyces cynoglossi complex.

references

Braun, Bradshaw, Zhao ao (2018a).

mod 5.x.2018