Pieter Groenhart died on November 3, 1965 at Leiden at the age of seventy-one. With him our country lost the one cryptogamist who clung steadfastly to lichenology. Groenhart was born on February 21, 1894 at Ilpendam, a small village just north of Amsterdam. In 1916 he became a teacher and was attached to several elementary schools in this country. In August 1926 he went to Java.