The invention relates to an upper cover for a plant culture box. The upper cover comprises a cover body and a ventilation membrane. The cover body comprises a gas hole provided for passage of gas. The ventilation membrane is disposed on the gas hole of the cover body and comprises a filtration material and a support material, in which the filtration material is utilized to filter the gas passing through the gas hole of the cover body so that external microorganisms, bacteria and so on are not allowed to pass through the gas hole of the cover body, and the support material is disposed on one side surface of the filtration material to increase the structural strength of the filtration material. Accordingly, with the upper cover of the invention covered on a box body of the plant culture box, the box body of the plant culture box can be maintained under an aseptic condition therein for promoting growth and development of plant tissues.本發明有關於一種植物培養盒之上蓋,包含有一蓋體及一透氣膜,蓋體具有供氣體通過之一氣孔,透氣膜設於蓋體之氣孔處且具有一濾材及一支撐材,濾材用來過濾通過氣孔之氣體,使外界的微生物、細菌等無法通過氣孔,支撐材設於濾材之一側面,用以增加濾材的結構強度,藉此,本發明之上蓋在蓋設於植物培養盒之一盒體時可以確實維持盒體內的無菌狀態,以利植物組織的生長及發育。12‧‧‧上蓋20‧‧‧蓋體22‧‧‧隆起部24‧‧‧氣孔30‧‧‧透氣膜
