Fig. 151. Hygrocrocis cuprica.
(in a solution of polychrome mixed with sulphate of copper).
This image is from Confervaceae in Pereira's Elements of Materia Medica and Therapeutics, 1854.
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Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.