Hi, years ago I found dark rust fungal spore mass inside the inflorescences of Lygeum spartium (Esperanto grass). Some five years later I still see the same infection in the same population. I am curious to investigate. For the moment, I can share only macro features and will hopefully work on the micro tomorrow and try to cultivate on culture media next week.
The dark brown spores only exhibits themselves inside the single floret of the species. Apart from its presence, it also deforms the flowers making it look to have 2-4 florets but it may be that each corresponds to the two glumes, lemma and palea (infection is causing dysplasia). One member (Bjorne) suggested and sp. which is probably correct, but a further resolution to species level is desired