Microsphaera alni
- Microscopic image of a section of a cleistothecium.
- http://www.apsnet.org/online/Archive/1998/sem17.htm

Uncinula necator
- Scanning electron microscope images showing tissues infected with this pathogen before and after treatment with a fungicide.
- http://www.apsnet.org/online/Archive/1999/necator.htm

Sphaerotheca spiraeae
- Photograph and information on this powdery mildew affecting a plant of Meadowsweet, Filipendula ulmaria.
- http://www-biol.paisley.ac.uk/bioref/Fungi_ascomycetes/Sphaerotheca_spiraeae.html

Order: Erysiphales (Powdery Mildews)
- A profile of the powdery mildews which are obligate parasites of flowering plants, with enlarged images of the conidiophores and conidium and some asci.
- http://www-biol.paisley.ac.uk/bioref/Fungi_ascomycetes/profile_Erysiphales.html

Powdery Mildew
- Photographs and information on Blumeria graminis which can cause serious damage to oats, barley, rye and wheat.
- http://www.hgca.com/hgca/wde/diseases/Mildew/Milhost.html

Powdery Mildew of Grass
- Erysiphe graminis is an epiparasite on grass blades. This and other mildews are a very successful group of fungal parasites that attack numerous plants. Photographs and information.
- http://www.uoguelph.ca/~gbarron/MISC2003/erysiphe.htm

Erysiphe cichoracearum
- Many photographs and enlarged images of this powdery mildew, parasitic on the plant family Cruciferae.
- http://www-biol.paisley.ac.uk/bioref/Fungi_ascomycetes/Erysiphe_cichoracearum.html