[1] The full titles of books and papers referred to in footnotes distinguished
by the addition of A after the date are given in the Bibliography at the end of
Volume I.
[16] The term metaxylem may be conveniently applied to the primary xylem
other than protoxylem; the latter is usually but by no means invariably
characterised by spiral thickening bands.
[19] Williamson (72) Pl. XLIV. p. 297, figs. 29, 30.
[20] ‘Exarch’ denotes that the protoxylem is on the outside of the primary
xylem; ‘endarch’ that it is on the inner edge or in a central position; ‘mesarch’
that it is internal, either near the inner or the outer edge of the metaxylem.
[39] Dangeard (91) and Bertrand, C. E. (81) recognise other species of Tmesipteris,
but it is doubtful how far such differences as exist are worthy of specific
recognition.
[58] Since this was written I have had an opportunity of seeing a leaf labelled
Tmesipteris from the Tertiary plant-beds of Florissant in a collection recently
acquired by the British Museum: the specimen bears no resemblance to a leaf
of the recent genus.
[98] This species is figured under the name Lycopodium crassum by Hooker
and Greville (31) Pl. 224. See also Brongniart (37) Pl. I. fig. 1.
[99] Hegelmaier (72). See also Hill, T.G. (06) p. 269; this author draws attention
to the fact that in some species of Lycopodium the mucilage canals are confined
to the sporophylls.
[100] Professor Yapp has drawn my attention to the very close anatomical
resemblance between a specimen of Lycopodium salakense obtained by him
from Gunong Inas in the Malay Peninsula and L. cernuum as represented
in fig. 125, H and I.
[102] Strasburger (73) p. 109; Brongniart (37) Pl. 8; (39) A. Pl. 32: Brongniart
figures stems of L. Phlegmaria and other species showing roots in the cortex.
See also Goldenberg (55); Bruchmann (74); Saxelby (08).
[103] Since this was written a comparative account of the sporophylls of
Lycopodium has been published by Miss Sykes. {Sykes (083).}
[121] The term solenostele, first used by Van Tieghem and revived by Gwynne-Vaughan,
may be applied to a stem in which the vascular tissue has the form of
a hollow cylinder with phloem and endodermis on each side of the xylem. As
each leaf-trace is given off the continuity of the vascular tube is interrupted.
See Gwynne-Vaughan (01) p. 73.