Two tufts found in a 20 minute search, one on Salix cf. x fragilis, another on Populus alba. I only had my phone so the shots are pretty hopeless, but they still convey the general impression of sparsely hairy calyptrae and longish setae. Even though the capsules were unripe and presumably the setae not fully elongated, this feature immediately caught the eye. The presence of a vitta seems to nail the id.
Note the leaf edge is curled up in the lower image making the vitta appear closer to the margin than it actually is.