gelatinous
adjective
having the nature of or resembling jelly, especially in consistency; jellylike.
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The pileus is between subgelatinous and fleshy; one to two inches broad; sometimes solitary, sometimes imbricated; flaccid, even, smooth, reniform, subsessile, pallid, then grayish.
From The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth by Miron Elisha Hard