Trembling, as in plume fern (9)

I believe the answer is:

asplenium

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'fern' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe there's a link between them I don't understand?

'trembling as in plume' is the wordplay.
'trembling' indicates anagramming the letters.
'as'+'in'+'plume'='asinplume'
'asinplume' with letters rearranged gives 'ASPLENIUM'.

Can you help me to learn more?

I've seen this clue in The Times.

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