R. luteotacta. Rea. Pileus spongy, solid and firm, hemispherical, 3 1/2 c. m. across, slightly umbonate, scarlet, becoming whitish at the margin, ruguloso-rivulose, margin striate. Flesh white, reddish under the pellicle, very thin at the margin and disappearing 2 m. m. short thereof, tinging yellowish when bruised or eaten by slugs. Stem spongily stuffed, 4 x 1 c. m. equal, attenuated slightly at the base, white, when injured yellowish, rugulose. Gills, broadest in front, attenuated behind, all furcate from the base, rarely any intermediate gills, very light straw, when wounded turning yellow, adnate. Taste of flesh acrid, of gills very acrid. Spores white granular 6-7 m. m. m.
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