Mexican Tropical Montane Cloud Forests (TMCF) constitute a unique ecosystem at the intersection of Nearctic and Neotropical biotas. Lichens are an important component of this ecosystem, yet studies on lichenized fungi in Mexican TMCF remain scarce. Here, we compiled and analyzed data on lichenized fungi associated with Mexican TMCF, evaluating species richness, beta diversity, functional diversity, and their relationships with habitat suitability, connectivity, environmental distance, and arboreal composition. This approach aimed to assess current knowledge and identify potential mechanisms shaping lichen communities across 13 priority TMCF regions for conservation countrywide. A total of 571 lichen species, spanning all major growth forms (crustose, foliose broad-lobed, foliose narrow-lobed, fruticose, and dimorphic) with sexual and asexual structures, growing on bark, soil, rocks, and leaves. Among 13 priority regions, Central Veracruz showed the highest species richness (257), while the Northern Mountains and Chiapas Highlands recorded the lowest (4), revealing significant sampling bias in existing data. Spatial analyses highlighted high inter-regional species dissimilarity, largely due to uneven sampling. Arboreal composition and environmental variables influenced lichen metacommunities. Despite the ecological importance of lichens, substantial geographic and taxonomic biases persist, underscoring an urgent need for expanded collection efforts to better understand the distribution and ecological roles of lichen biota in Mexican TMCF. Keywords: Cloud forest · Environmental distance · Functional traits · Priority regions for conserving the TMCF · Species replacement · Species richness differences.