<![CDATA[This study aimed to develop a pocket book on the types of macrofungi found in the Pekanbaru City Forest as a valid supplementary teaching material for biodiversity learning in Grade X senior high school. The research employed a quantitative descriptive method using the ADDIE model, which consists of five stages: Analysis, Design, Development, Implementation, and Evaluation. However, this study was conducted only up to the Development stage. The pocket book was designed at the Biology Education Study Program, Faculty of Teacher Training and Education, Universitas Riau. The developed pocket book was subsequently validated by two experts, namely a media expert and a subject matter expert. The media validation instrument assessed three aspects: content feasibility, language feasibility, and visual presentation. Meanwhile, the material validation instrument evaluated content feasibility, language, and presentation or illustration aspects. The validation results indicated that the pocket book on the types of macrofungi in the Pekanbaru City Forest achieved an average validity score of 3.9, which falls within the highly valid category. Therefore, the pocket book is considered suitable for use as a supplementary learning resource for teachers and students in senior high school biology learning, particularly on biodiversity topics.]]>
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