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Books about Birrus:
Lessico etimologico Italiano. Band 6: Birrus-Brac(C)Hiolum (Italian Edition) by Max Pfister (Jan 2000)
Wiki information Birrus:
A birrus or birrus brittanicus was a rainproof, hooded woollen cloak, characteristically worn in Britain and Gaul at the time of the Roman Empire and into the Middle Ages. A mosaic at Chedworth Roman Villa shows a Briton wearing a birrus brittanicus...
Hebeloma birrus is a species of mushroom in the Hymenogastraceae family.