Helicobasidiaceae

Tuberculina sbrozzii Cavara & Sacc., 1899

Il s'agit de Puccinia vincae (la rouille de la Pervenche) sur la photo, mais qui est hyperparasitée par Tuberculina sbrozzii.

You can see it on the tip of the leaf in the lower left. There, the uredia/telia are not darkbrown but rather have a pale, violett appearance. That's because they are covered by the sporodochia of the hyperparasite. It's fairly common on Puccinia vincae. If you take a microscopic look, you can see the conidiophores that produce a single conidia at their top, see e.g. https://sites.google.com/view/ruhrpott-pilze/phytoparasiten/t/tuberculina-sbrozzii