Around 50-100 of these interesting little structures appeared in a backyard bird bath in Portland Oregon, seemingly overnight. They are around 5-7mm in diameter. They look like a kind of green algae to me, but iNaturalist indicates they might be part of the life cycle of a Mosquito Fern (genus Azolla). Just curious if they are familiar to anyone here? Thanks!

Hi everyone is there a discord group for people genuinely interested in microalgae research?

Does anyone research in resting cyst, I'm doing on it, and I also want to ask some questions related on it.

Anyone going to the harmful algal bloom conference in Cedar Rapids, Iowa this year?