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Volume IV (1988) - Flora of New Zealand Naturalised Pteridophytes, Gymnosperms, Dicotyledons
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Psilotopsida Lycopsida

PSILOTOPSIDA, LYCOPSIDA, EQUISETOPSIDA

KEY TO GENERA OF FERN ALLIES (PSILOTOPSIDA, LYCOPSIDA, EQUISETOPSIDA)

Key

1
Plant aquatic; lvs > 3 cm long
ISOETES†
Plant terrestrial or epiphytic, or, if submerged in water, lvs < 3 cm long
2
2
Lvs and branches arising in obvious whorls at nodes along stem
EQUISETUM
Lvs and branches alternate, opposite, or spirally arranged on stem
3
3
Stem markedly angled; lvs reduced to tiny scales lacking veins; sporangia fused in clusters of 3
PSILOTUM†
Stem not markedly angled; each lf with 1 vein; sporangia borne singly, in pairs, or in cones
4
4
Sporangia fused in pairs on upper edge of a 2-lobed lf; plant usually epiphytic with drooping stem
TMESIPTERIS†
Sporangia either produced singly on upper surface of lf, or in distinct cones; plant terrestrial or epiphytic
5
5
Plant terrestrial, upright, < 5 cm high, growing as a rosette of lvs from a tuber; sporangia in a single terminal cone
PHYLLOGLOSSUM†
Plant scrambling, climbing, or epiphytic, or, if terrestrial and upright, > 5 cm high with lvs borne on stems; sporangia in terminal or lateral cones, or on upper surface of lf
6
6
Lvs of delicate texture, ± ovate; cones inconspicuous, < 10 × 2 mm
SELAGINELLA
Lvs harsh, more than twice as long as broad, linear or tapering to a pointed apex, broadest at base; cones conspicuous, > 10 mm long or 2 mm wide (rarely 0)
LYCOPODIUM†
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