Nostoc species are sometimes harvested and/or cultivated for culinary use.
Chinese viewers might be familiar with fat choy (fa cai), a related species (Nostoc flagelliforme, previously classified as the same species, Nostoc commune var. flagelliforme) often served as a delicacy during Chinese New Year banquets (because it's almost homophonic with "to get rich").
This is
Nostoc commune
(ishikurage).
It's a type of terrestrial cyanobacterium from the genus Nostoc. After rains, It can be found as a slimy, seaweed-like substance in backyards and curbsides.Why are you bringing up that topic with me...!?Ooooooh!
It really does look like seaweed!
Naganaga!slimyslippery