[166] Itzigsohn 1854.
[167] Hicks 1860 and 1861.
[168] Speerschneider 1853.
[169] Famintzin and Baranetzky 1867.
[170] Baranetzky 1869.
[171] Itzigsohn 1867.
[172] Bayrhoffer 1851.
[173] Tulasne 1852.
[174] Speerschneider 1854.
[175] de Bary 1866, p. 242.