My colleague, André De Kesel from the Botanic Garden Meise in Belgium, and myself wrote a review article about Hesperomyces virescens, the microscopic fungus that is an ectoparasite of ladybirds (Coleoptera, Coccinellidae). The paper turned out to be a thorough review with an overview of all reports of all Laboulbeniales associated with ladybirds. The paper is written in Dutch, but captions of figures and tables as well as the abstract are available in English. The PDF is available here.
Below is one of the beautiful photos used in the paper, taken by André.