[275] Meyer 1902.

[276] Salter 1902.

[277] Nylander (1866) gave the term “gonimia” to the blue-green algae of the Phycolichens, retaining the term “gonidia” for the bright-green algae of the Archilichens: the distinction is not now maintained.

[278] For further details [see also the chapter on Classification].

[279] [See p. 133.]

[280] Krempelhuber 1873.

[281] Chodat 1913.

[282] Paulson and Hastings 1920.

[283] Paulson in litt.

[284] Acton 1909.