The paper is one of the cycle deals with reconstructions of the ancient Jurassic phytoorictocenosises from the Irkutsk coal basin. The paper presents the findings of investigations into the Middle Jurassic communities with participation of plant fossils of Czekanowskia genus. Based on taphonomic and facial characteristics the classification of phytoorictocenoses is developed. The proposed structure and ecology of parent communities are reconstructed from the studied material. Prodromus of the flood plain fossil vegetation composed of three associations belonging to the Czekanowskia genus is first described. The detailed diagnoses of parasyntaxons are given.