[885] Zopf 1907.
[886] Zopf 1892.
[887] Knop 1872.
[888] Bachmann 1890.
[889] A similar reaction with nitric acid is produced on the blue hypothalline hyphae of Placynthium nigrum.
[890] Knowles 1915.
[891] Rosendahl 1907.
[892] John 1819.
[893] Grimbel 1856.
[894] Molisch 1892.