Plantae material consists of three primary materials, namely moss, ferns, and seed plants. Moss plant material is difficult for students to understand. Hence, It is necessary to develop an e-book on moss plants that can provide learning solutions related to moss plant material. This study aims to measure the level of validity, feasibility assessment by High-School Biology Subject Teacher Forum (STF) in Semarang City, and student readability. The research and development method used is the 4-D development model. Several stages in the development research are define, design, develop and disseminate. The development stage includes expert validation, feasibility, and student readability tests. The research subjects are students of class X SMA N 12 Semarang. The data collection instruments are expert validation sheets, assessment sheets, and readability sheets. The analysis technique used is descriptive data analysis. The result of the e-book validity test for the material content, presentation, and language assessment aspects are 96% (very good), 96% (very good), and 94% (very good), respectively. The results of the assessment by learning media experts is 93% (very good). The e-book feasibility test by STF in Semarang is 95% (very good), and the e-book readability test is 90% (strongly agree).

Moss plants in tropical mountain forest areas play an essential role in water balance and the forest’s nutrient cycle, serving as a substrate, food source, and a place for forest organisms to live. This study aims to analyze the diversity of moss plants in Mount Lawu and Baturraden Botanical Gardens based on the height of the place and substrate type. Moss plants were observed along the Cemoro Kandang hiking trail and around the Baturraden Botanical Garden. A total of 30 species of mosses consisting of 19 species of true mosses, 10 species of liverworts, 1 species of hornworts. The moss plants on the hiking trail are included in 13 orders and 20 families. There are 13 species of mosses found in the Baturraden Botanical Garden, including 7 orders and 10 families, including 8 species of true mosses, 4 species of liverworts, and 1 species hornworts. The highest moss species diversity at the two locations is true mosses (Bryophyta). Most of the mosses are terrestrial mosses. True mosses are evenly distributed in the highlands rather than the lowlands.