author
A careful early twentieth-century natural history writer, remembered today for co-authoring a detailed study of British woodlice. His surviving published work points to a patient observer with a strong interest in small, easily overlooked creatures.

by Wilfred Mark Webb, Charles Sillem
Very little biographical information about Charles Sillem could be confirmed from the sources available during this search. What is clear is that he is credited, alongside Wilfred Mark Webb, as the co-author of The British Woodlice, a study of terrestrial isopod crustaceans in the British Islands that was published in the early 1900s.
The book has had a long afterlife in library catalogs and digital archives, which suggests that it remained useful as a specialist work of natural history. Even from that single confirmed title, Sillem comes across as part of the tradition of practical, close-looking naturalists who helped document the smaller corners of the natural world.
Because reliable personal details were scarce, it is best to remember him through the work itself: a focused, collaborative contribution to British zoology and field observation.