Where are the missing lichens

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One hundred new species of lichenized fungi : a signature of undiscovered global diversity (2011, background): “…species are expected in poorly studied areas, such as tropical forests or in under-explored habitats, for example living on or in insects, plants or lichens (Hawksworth & Rossman 1997, Frohlich & Hyde 1999, Taylor et al. 2000a, Sipman & Aptroot 2001, Lawrey & Diederich 2003, Arnold & Lutzoni 2007).”
Biodiversity of lichens, including a world-wide analysis of checklist data based on Takhtajan’s floristic regions (2007, background): “…number of currently recognized lichens range between 13,500 (Hawksworth et al. 1995) and 20,000 when including “orphaned” species (i.e. species which have not, or have only rarely, been recorded after their initial description and are not covered in modern revisions) (Sipman and Aptroot 2001).”