Parmelia lambii is a species of foliose lichen in the family Parmeliaceae.

Although the specimen was later lost, Elke Mackenzie had examined it and written up an unpublished description in 1959.

[3] Based on Mackenzie's detailed description, Dag Olav Øvstedal proposed in 2009 that the specimen actually represented a previously unrecognized species of Parmelia.

He considered that the minute punctiform (point-like) pseudocyphellae suggested a position in genus Punctelia, but the presence of atranorin and salazinic acid as lichen products indicated a placement in Parmelia.

Because the name Parmelia tabacina had already been published for another taxon, a new name was need, and so Øvstedal honoured Elke Mackenzie (formerly Lamb) in the new specific epithet lambii.