largest of all of the Penicillus species, often growing up to
8" tall. Also characteristic of this calcareous algae is that
the top is more tapered and flat. It is abundant on the reef flat
and among sea grass beds. It's root-like structure is a large bulb
with a series of rhizoids that anchor it to substrate and
sometimes rocks. It occurs in shallow calm protected water to
depths of 40 ft. In the aquarium the mature plant often dies to
produce new plants at it's base. Like most calcareous stem plants,
it needs a deep sand bed of 4" or more to grow in the
aquarium. Calcium supplementation is needed. Not very palatable to
fish or invertebrates.
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