i·sid·i·um

[ahy-sid-ee-uhm]
noun, plural i·sid·i·a [ahy-sid-ee-uh] . Botany.
a coralloid outgrowth from the thallus in certain lichens.

Origin:
1865–70; < Neo-Latin, derivative of Isid- (stem of Isis) Isis (from the hornlike appearance of the growth); see -ium

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Isidia is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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For reproduction, lichen possess isidia, soredia, and undergo simple fragmentation.
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