Britsih Confervae; or Colored Figures and Descriptions of the British Plants referred by botanists to the Genus Conferva. 1802 - 1809. 116 col. copper plates., 87 p. 4to. Halfleather.

A book containing 277 algal specimens Dillwyn amassed. He is an important figure in Welsh history and many of the specimens he collected were from or near Swansea where he lived. The herbarium contains specimens which are the original material used by Dillwyn in the preparation of his pioneering 1809 work on British Confervae. (Conferva is an old name for filamentous algae. These can be freshwater or marine, and include some seaweeds. Linnaeus used Conferva as the genus name for that group, as did Dillwyn. However, filamentous algae have since been split into many different groups). This work contains beautiful colour drawings of algae and was a significant step for algology. Before its publication, there had been only 34 species described, this jumped to 177 described species after its publication. This is an important exsiccatae in our collection which may include a substantial number of type specimens