In article ,
CurtAdams  wrote:
>
>Technically all animals  *do* have unicellular forms -
>the gametic stage.  Fungi have unicellar spores, although they do
>often travel in small packs within ascii.  Only in plants are all stages
>multicellular, and it's by a nose hair with pollen grains.

You know what I mean, though:  There are many species of animals, fungi,
and plants for which multicellularity is *not* optional.  The "adult"
form of the species is always multicellular.  There are other species,
such as certain Choanoflagelates, where cells can group together or not
as they please.  My question was whether any species of red algae,
brown algae, or slime molds were "obligate multicellular" like goats,
oak trees, or portabella mushrooms.  For example, can the brown algae
that make up kelp also live on their own as single cells, or are they
always part of a kelp frond? 

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