You'll have to be a little more specific in which ones... Some will never regenerate a holdfast if you just take them as cuttings. Your best bet is to throw your mask and snorkel on, and find small enough specimens that can be taken along with the rock that they are attached to (or chiseled away from, if possible).

So in short, you need to find whole, healthy specimens if you want to be succcessful. Taking specimens that wash up on shore, sometimes work, but they are often on their last legs ('sea-legs') and don't last too long.


Hopefully someone with advanced knowledge can comment on the collection of specimens for reproduction (gametophytes/sporophytes??).

Cheers,

RAS