Podosphaera macrospora (Braun) Braun & Kummer, 2008

on Saxifragaceae

_3218_0

Tellina grandiflora, Belgium, prov. Antwerp © Carina Van Steenwinkel

Podosphaera macrospora on Tellina grandiflora

another leaf, underside

Podosphaera macrospora on Tellina grandiflora

tiny cleistothecia

Podosphaera macrospora: cleistothecia

cleistothecia

Podosphaera macrospora: cleistothecia

cleistothecia and asci

Podosphaera macrospora: conidiophore

conidiophore

Podosphaera macrospora: conidum

conidium

gall

mycelium amphigenous, forming persistent greyish white spots. Appressoria rather indistinct. Conidia formed in chains, with fibrosin bodies. Cleistothecia with a single ascus, containing (6-) 8 spores. Appendages in variable number, mostly sub-equatorial, 0.3 – 3 x the diameter; they are myceloid, mostly unbranched, generally entirely brown.

hostplants

Saxifragaceae, oligophagous

Heuchera sanguinea, villosa; Saxifraga nelsoniana; Tellima grandiflora; Tiarella cordifolia, wherryi; Tolmiea menziesii.

notes

North American species, in Europe only on garden ornamentals.

Ampelomyces quisqualis on Podosphaera macularis on Telina

part of the mycelium had a greyish brown colour, because it was parasitised by Ampelomyces quisqualis.

references

Ale-Agha, Boyle, Braun ao (2008a), Beenken & Senn-Irlet (2016a), Braun & Cook (2012a), Bresinsky (2016a), Klenke & Scholler (2015a), Kruse (2014a).

19/04/2017

pub 25.v.2017 · mod 14.vii.2017