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The purposes of research were to study air quality, temperature, relative humidity (RH) in P. alternifolium garden, to study P. alternifolium characteristics, bark texture, stem size, number of aerating root and to study the lichens diversity on P. alternifolium. Procedures were proceeded according to the Globe protocols. From the results, Area around small P. alternifolium had temperature from 23.2-23.6ºC averaged at 23.4 ± 0.2ºC and RH from 69-77%RH averaged at 73 ± 3%RH. They had rough stem, stem size from 14-27 cm averaged at 20 ± 6 cm, aerating root from 3-5 roots averaged at 4 ± 1 roots and they were discovered crustose type, 2 family, Graphidaceae Chrysotrichaceae, 2 genus, Ocellularia Chrysothrix, 2 species, Ocellularia sp.1 C. candellaris. Ocellularia sp.1 was discovered the most at 73%RA. Diversity and evenness index of lichens was equal to 1.63 and 2.35, respectively. Area around large P. alternifolium had temperature from 23.1-25.3ºC averaged at 23.9 ± 0.9ºC and RH from 79-99%RH averaged at 87 ± 9%RH. They had rough stem, stem size from 32-39 cm averaged at 36 ± 3 cm, aerating root from 5-12 roots averaged at 8 ± 3 roots and they were discovered crustose type, 4 family, Graphidaceae Arthoniaceae Chrysotrichaceae Physciaceae, 6 genus, Graphis Ocellularia Cryptothecia Chrysothrix Sarcographa Amandinea, 7 species, Graphis sp.1 Ocellularia sp.1 Cryptothecia sp.1 C. candellaris S. labyrinthica A. extunata Cryptothecia sp.2. Ocellularia sp.1 was discovered the most at 50%RA. Diversity and evenness index of lichens was equal to 16.83 and 8.65, respectively. So, the results show that the relations between air quality and botanical characteristics of P. alternifolium effected on lichen diversity. The air quality, it was higher temperate, humid and the botanical characteristics of P. alternifolium, they had the larger stem size and more aerating root relate to higher diversity of lichens.