Note 15 — Chapter II
Reading edition
Bailey, C. Notes on the structure, the occurrence in Lancashire, and the source of origin, of Naias gramineus Delile, var. Delilei magnus. Journal of Botany, Vol. XXII. p. 305. 1884.
Weiss, F. H. and H. Murray. On the occurrence and distribution of some alien aquatic plants in the Reddish Canal. Mem. Proc. Manchester Lit. and Phil. Society, Vol. LIII. Pt. II. 1909.