Lichen is a symbiotic organism consisting of algae (photobionts) and fungi (mycobiont). In Indonesia, Usnea is the only genus of lichen that has been widely recognized and used by the local community for traditional medicine. It is locally known as kayu angin, rusuk angin, or janggot Kai. Furthermore, it produces lichen acid and other compounds as secondary metabolites that need investigation. Therefore, this study aimed to identify species and determine the secondary metabolites of Usnea in West Java. There were 13 species of Usnea identified, with U. rubrotincta, U. mutabilis, and U. barbata being new to West Java. The extraction of U. esperantiana has the highest number of lichen acids, with 20 different types identified. This study showed that Usnea contains lichen acid, flavonoid, and saponin compounds. The secondary metabolites are a potential source of natural products for bioprospecting.

Research into local community knowledge is very important to provide medicinal plant data and can be used as a basis for further research. Usnea is a genus of lichen that is used by Indonesian people in traditional medicine. The people knows Usnea as Kayu Angin. The aim of this study was to record the use of the species of the genus Usnea as traditional herbal medicines in Jakarta's tradisional market. The study was a part of a project called Hibah Dosen Pemula (PDP) RISTEKDIKTI. Respondents were interviewed using a semi-structured questionnaire. Data were descriptively analyzed based on exploration results and interviews with respondents. The result showed 14 species of Usnea had been founded and were used to treat different ailments. The collection of data and information about the use of Usnea in Jakarta's tradisional market was firstly recorded and expected could be enriched Usnea data from Java.

Usnea is a genus of lichen used as a traditional medicine in the form of herbal medicine. The people of Bogor know Usnea as kayu angin, antanan, and cecenetan. Usnea used in herbal medicine is often considered only one species, even though there are many different species. Information about the traditional use of Usnea is essential to increase the widespread use of natural resources. This study purposed to determine the types of Usnea and their use as traditional medicine by the people of Bogor city. A total of 30 respondents were interviewed using semi-structured questionnaires and personal interviews. Data were analyzed descriptively based on the results of exploration and interviews with respondents. The results showed that six species of Usnea had been used for treatment, including U. intermedia, U. esperantiana, U. hesperina, U. pectinata, U. fragilescens, and U. baileyi. Usnea is used for health herbs, after childbirth, colds, gout, and herbal mixtures in all medications