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Hi Gloria, Paul & All, Dec 26, 2006
With that lead I looked in Brodo, Sharnoff & Sharnoff (Lichens of
N.A.) and found sea tar [aka black seaside lichen (_Verucaria maura_)].
Not a positive ID but a likely suspect.
Their comments include-- 'mainly on siliceous, coastal rocks in the
upper part of the intertidal zone and continuing into the salt-spray
zone'...' It can easily be mistaken (and has been) for the residue of
oil spills...'
Yt, DW, Kentville
Gloria Gilbert wrote:
> During a guided walk at Thomas Raddall Park when the Port Joli Basin
> Conservation Society launched their new brochure on lichens, I learned
> that the black greasy deposit on rocks just below the high tide mark
> is actually a tiny lichen. Of course this means that an algae is
> present too, since they live in symbiosis.
>
>
>
> The really interesting question is, "Why does it flourish on some
> shorelines and not on others?"
>
>
>
> I'll venture a guess that the answer has much to do with the
> nourishment of the algae component.
>
>
>
> I'm curious too!
>
>
>
> Gloria
>
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