hydathode

through epidermal and epithemal hydathodes (Haberlandt, 1914;

exude through hydathodes located at the tips, edges, adaxial and abaxial

Multicellular trichomes are present on the petiole of all evaluated species, classified in four types according to their shape and structure: hydathode trichome (Figure 2A), long cone-shaped trichome (Figure 2B), bulb-like base trichome (Figure 2C), and short cone-shaped trichome (Figure 2D), with distinct distribution among the species, and easily differentiated under SEM (Figure 2E-G).

Hydathode trichome, present on the petiole and on the margin of the leaflets of A.

1 mm aptot, diverging at 65-80[grados] from costa; hydathodes absent; fertile fronds 22-32 cm long; stipes ca.

simple), 1-1.5 mm apart, diverging at 80[grados] from costa; hydathodes absent; fertile fronds not seen.

0.2 mm, linear-lanceolate to subulate, dark-brown, dispersed, marginally entire; blades 9-22 x 3.0-5.8 cm, chartaceous, lanceolate to oblong-elliptic, basically obtuse to truncate, apically acuminate to cuspidate; blade scales 0.7-1.2 x 0.1-0.3 mm, linear to subulate, dark-brown, dispersed, marginally entire, only on blade margin; veins evident, 1-2-forked, 1-1.5 mm apart, diverging at 65-75[grados] from costa; hydathodes absent; fertile fronds 17-28 cm long; stipes 3/5-3/4 the frond length; fertile blades 4.5-10.5 x 1.3-2.8 cm, lanceolate, basically obtuse to truncate, apically acute; intersporangial scales absent.

0.1-0.2 mm, linear to subulate, dark brown, dispersed, marginally entire; blades 1431 x 3.1-5.4 cm, narrowly elliptic to oblong-elliptic, subcoriaceous, basically cuneate, apically acute to cuspidate; blade scales 1-2 x 0.1-0.3 mm, linear to subulate, dark brown to atropurpureous, marginally entire, only on blade margin and rarely on base of costa, dispersed of absent; few evident veins, simple or 1-forked, 1-2 mm apart, diverging at 60-75[grados] from costa; hydathodes absent; fertile fronds 30-45 cm long; stipes 3/5-4/5 the frond length; fertile blades 10.5-17 x 2.6-3.2 cm, lanceolate to elliptic, basically cuneate to obtuse, apically acute to acuminate; interporangial scales absent.

1 mm apart; hydathodes absent; fertile fronds 9 cm; stipe ca.

80[degrees] angle from costa; hydathodes absent; fertile fronds 38-44 cm long; stipes 1/3-3/5 of the frond length; fertile blades 20-25 x 0.6-1.1 cm, linear, basically cuneate to obtuse, apically acute; intersporangial scales not seen.

and thickening in the tracheids near the hydathodes (Garg et al., 1994).

hydathodes. Since this coloration is produced only with the metal