[195] Treub 1873.
[196] Borzi 1875.
[197] Stahl 1877.
[198] Bonnier 1886 and 1889.
[199] Bonnier was probably experimenting with an Arthopyrenia. Verrucaria species combine with Protococcus or according to Chodat with Coccobotrys gen. nov.
[200] Nylander 1858.
[201] Fuisting 1868, p. 674.
[202] Winter 1876, p. 264.
[203] Stahl 1877.