[475] Solms-Laubach (91) p. 186.
[476] Lesquereux (79) Pl. LXII. fig. 1.
[477] Heer (65) p. 89.
[478] Buckman (50) 1.
[479] Gardner (86) p. 203.
[480] Ludwig (59) p. 165, Pl. LXIII. fig. 9.
[481] Schimper and Schenk (90) p. 75.
[482] e.g. the Fern Trichomanes Goebelianum Gies. Giesenhagen (92) p. 157.
[483] Scott (96) a text-book for elementary students; a full account is given of Equisetum and other genera of primary importance. Vines (95) Part iii. Campbell (95), Luerssen (89) in Rabenhorst’s Kryptogamen-Flora, vol. III., Van Tieghem (91), de Bary (84), Baker (87).
[484] Wallace (86) p. 117.