_Plano-convex_ (of the cap), regularly rounded although almost flat. See Plate 13, p. 67--adult fruit-body. _Pruinose_ (of the cap and stem-surfaces), finely powdered. _Pubescent_ (of the cap and stem-surfaces), with short, soft hairs. _Putrescent_ (of the fruit-body), soft and very easily decaying. _Pyriform_ (of the spore), pear-shaped. _Regular_ (of the gill-trama in transverse longitudinal section), with hyphae showing no distinct curvature and practically parallel to the gill-surfaces. See Fig. 9C, p. 17. _Remote_ (of the gills or tubes), separate from the stem by a zone of cap-flesh. See p. 267. _Resupinate_ (of the fruit-body), spore-bearing tissue facing outward and attached to support by what would have been the cap had the fungus been a normal agaric. _Ring_, a girdling veil on the stem. See p. 267. _Rugulose_ (of a surface), covered in small wrinkles. _RUST-BROWN_, the colour of rusty iron. _Saprophyte_ (of an organism), using dead material for active growth. _Scurfy_ (of the cap and stem surfaces), with small irregular loosely attached scales. _Sessile_ (of the fruit-bodies), lacking a stem. _Septate_ (of the structural units of the fruit-body), with cross-walls; septum--cross-wall. _Sinuate_ (of the gills), having a concave indentation of that part of the edge nearest the stem. See Plate 32, p. 111. _SNUFF-BROWN_, a dull dark clay-brown said to resemble the colour of snuff. _Spore-print_ (or deposit), the mass of spores obtained by allowing the fruit-body to discharge its spores at maturity. _Stem_ (of the fruit-body), that structure which supports the cap (= stipe). _Sterile_, a tissue or structure not involved in the reproductive process, or failing to take part. _Sterigma_, the point-like structure at the apex of the basidium actually bearing the spores. _Striate_ (of a surface), having minute furrows or lines. _Subdecurrent_ (of the gills or the tubes), having the gill-attachment extending slightly down the stem. See p. 267. _TAWNY_, sand-coloured. _Tomentose_ (of the cap and stem surfaces), densely matted and woolly. _Toothed_ (of the gills or cap-margin), as if with teeth (= dentate). _Trama_ (of the gills), the tissue between the layers bearing basidia (hymenia). _Umbilicate_ (of the cap), having a central, small depression. See p. 267. _Umbonate_ (of the cap), provided with a broad, flattened, raised centre (the umbo). _Uncinate_ (of the gills), emarginate, but with a long descending decurrent tooth because the cap does not expand. See Plate 14, p. 69. _Veil_, a general term for the tissues which protect the whole or part of the developing fruit-body. _Viscid_ (of the cap or stem), very slippery to the touch. _Volva_, a persistent cup-like structure at the base of the stem. See p. 267. _Waxy_ (of the gills), lustrous because they are thick and watery. _Illustrations_