[725] Keiszler 1911.

[726] Nylander 1858, p. 37.

[727] Möller 1887.

[728] Istvanffi 1895.

[729] Möller 1888.

[730] Hedlund 1892.

[731] Tulasne 1852.

[732] Müller 1885.

[733] Lindsay 1859 and 1872.

[734] Laubert 1911.