Irwin Murray Brodo, a world authority on the identification and biology of lichens, reported that Plitt had a private collection of over 10,000 lichen specimens. This collection was estimated to be the third largest at the time.
Irwin Murray Brodo, an expert in lichenology, reported that Plitt maintained a private collection of over 10,000 lichen samples. The size of this collection was considered significant and among the largest known at the time.