The stems of the first one used to be chewed by kids just like they would a stalk of rhubarb
It gets sweeter somehow the longer you chew it. I didn't know the Latin names for them, but Brynglas' posts naming them properly gives a hint to the sweetness
It's not sugary sugary sweetness, it's just a not bitter, not sour, not unpleasant stuff. Satisfying though when your teeth itch. I think the last time I chewed it my second back teeth were coming in, and that was most certainly not yesterday
I can imagine how folks would react now to kids wandering around chewing stalks of seaweed though; it'd be comments about it being dirty, and you don't know where that's been, just like the rain!
As far as I know, and it'd be good to have it confirmed, there are no poisonous seaweeds growing around our coasts….provided the water isn't polluted.
Not a lot of calories, but they're handy as gelling and firming agents, add an unami type seasoning, and can be very palatable cooked too.
M