This catalog consists of scans of cards from the "John William Index of Palaeopalynology" compiled by John Williams between 1971 and 2010 - see also this page.
The cards inclued here are only those for the acritarchs, they are sorted alphabetically for simple browsing. You can also use search boxes at the top & bottom of the page to find specific taxa
There are PDF (higher quality) and jpeg (faster opening) copies of the cards, the content of them is identical
Filisphaeridium has 106 sub-taxa these are grouped in 3 pages 1 F. ara :: 2 F. fol :: 3 F. piv
