Fuliginous

_Mathematical Invention_ delighting the _Mind_, and for the _Violence of its Exercise_ bringing Health to the _Body_, causing it to transpire plentifully, and by Sweats dissipate and expel those Fuliginous thick

The School of Recreation (1684 edition) Or, The Gentlemans Tutor, to those Most Ingenious Exercises of Hunting, Racing, Hawking, Riding, Cock-fighting, Fowling, Fishing Robert Howlett

Fuliginous (or fuligineous), dark brown, sooty or smoky.

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson 1886