This observation refers to some "life" occuring on a leaf of a Quercus tree (maybe Q. suber). This same leaf was already considered at another observation
https://www.biodiversity4all.org/observations/104829577
since some "nut" galls, identified as Dryomyia lichtensteinii, were found on it. But because this leaf is full of black dots I decided to analize some of the dots. Initially my impression was that a fungus was invading the leaf, but then I decided to observe it under the microscopy. I could not find any structure that relates it to any fungi I know; Otherwise, though I'm not familiar with animal stuctures under the scope, I believe that "this is it". A rough description is easy; The structures observed seem like worms connected together at a point, like a octopus, and radiating from there, the worms being the arms. Can anyone say something more consistent?
Tubifera ferruginosa?