what creates willow moss?

Question

what im trying to ask is what is the reproductive structure of willow moss

Answer 1

Are you asking about the aquarium moss? This can reproduce vegetatively by having pieces break off the stems of existing plants, or sexually by producing spores which get washed away in the water.

This is the best I could find of an illustration showing the sporophytes as they'd e seen on the plants: http://delta-intkey.com/britms/images/berke03.jpg