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drawings and photographs used to illustrate Mann's thesis and drawings on permatrace used in other publications.

Added in 2020 (RBGEA2020/007):

3 sets of postcards depicting algae or diatoms as follows:

• 3 envelopes of Algal picture postcards from M. Adei; Scanning electron micrographs of diatoms (1994); Marine algae in coral reef (1993); and Algal vegetation in cold current area (1993)
• pack of 12 poscards from the British Bryological Society (1994)
• pack of Stereographs of the Diatom World, The Educational Association of Algae (2002)