PENGEMBANGAN BUKU PENGAYAAN KEANEKARAGAMAN LIKEN BERBASIS RISET DI KAWASAN TAHURA BUKIT BARISAN TONGKOH KABUPATEN KARO

The aim of this study is to produce a product in the form of an enrichment book on Lichen Diversity in the Bukit Barisan Forest Park which is appropriate for students, teachers, students, or the general society in enriching knowledge, introduction and understanding of lichen. This type of research is research and development (Research and Development). The results of the field research are used to develop enrichment book products. The development model used in this research is the Thiagarajan (4-D) development model which consists of the stages of defining, designing, developing and disseminating. The enrichment book that was developed and was validated based on the material aspect and presentation of the material by the material expert validator, so the score was obtained in the form of a percent, that is 93% with a very decent category. Furthermore, the language aspect of the book has been validated by linguists, so the score has obtained in the form of a percent, that is 91% with a very decent category. Finally, for the graphic aspect of the book, which was validated by a designingexpert, the score was obtained in the form of a percent, that is 91% with a very decent category.The results of product trials for the developed enrichment book were obtained from three aspects, namely, individual trials obtained scores in the form of percent, that is 92.5% in the very feasible category, small group trials obtained scores in the form of percent, that is 90.6% with the very feasible category and the limited group trial obtained a score of 91% in the very feasible category.