The Essex Naturalist 69 Table 1. Plants recorded in the old Redbridge Southern Sewage Works during the years 1991 to 1997. Pteridophyta Equisetum arvense Field horsetail. A small amount on west side of Dell Bridge entrance, Area 1, N6 in 1996; More common in Area 3a, N6. (1992-97). Dryopteris filix-mas male-fern. A plant just inside the park boundary M6 in Area 1, M6. (1992-96). Gymnospermae Taxus baccata yew. A single seedling in The Wood, N5, noted in early 1994-