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Rh means a great deal, and this is determined by laying the fungus cap gills down on gray paper for six or eight hours under a glass.

Poisonous Toadstools Of all the poisonous kinds the deadliest are the Amanitas. Not only are they widespread and abundant, but they are unhappily much like the ordinary table mushrooms. They have however one or two strong marks: Their stalk always grows out of a "poison cup" which shows either as a cup or as a bulb; they have white or yellow gills, and white spores. The worst of these are:

Deathcup, Destroying Angel, Sure-death, or Deadly Amanita (Amanita phalloides) One and one half to five inches across the cup; three to seven inches high; white, green, yellowish olive, or grayish brown;