Underwood and Lloyd: Lycopodium 103 



Leaves rigid, thick, ascending; sporangia 1.8 mm. wide. 



2. Z. rigidum. 

 Plants spreading or pendent ; leaves lax, somewhat secund. 



9. L. portoricense. 



Leaves longer, 1.5 cm. 



Leaves linear, 0.6-0.8 mm. wide. 6. Z. montanum. 



Leaves lanceolate, I mm. wide. 7. Z. hippurideum. 



Plants epiphytic, pendent from trees. 

 Leaves short, 8 mm. or less long. 



Plants with slender, many times dichotomous stems. 

 Plants 60 cm. or more long. 



Strobiles compact ; sporophyls short, triangular. 



IO. Z. P ringlet. 



Strobiles lax ; sporophyls slender, subulate. 



8. Z. setaceum. 



Plants short, under 20 cm. long ; leaves very narrow, scattered, 



widely spreading. 20. Z. IVilliamsii. 



Plants with thick cord-like stems, closely dichotomous. 



Leaves slender, flaccid. 17. L. funifortne. 



Leaves broader at base, rigid. 16. L. Picardae. 



Leaves larger, 1-3 cm. long. 



Stems red, robust ; leaves 2.5 cm. long, sharply reflexed from near the 



base. 

 Stems green. 



12. Z. pithy 'oides. 



Leaves and sporophyls 4-ranked. 15. Z. nitens. 



Leaves and sporophyls 6-io-ranked. 



Leaves rigid, closely appressed. 14. Z. cuernavacmse. 



Leaves lax, spreading. 



Leaves narrow, less than 0.5 mm. wide. 



19. Z. Wilsonii. 



Leaves wider, 0.5-1 mm. wide ; midrib prominent. 



18. Z. dichotomwn. 



Plants more or less dorsiventral by the twisting of the leaves. 



Leaves sharply twisted at the base, usually narrowed below. 

 Plants short, 25 cm. or less long. 



Stems short, dichotomous from near the base ; leaves crowded, short and 



rigid ; midribs prominent. 



13. Z. Orizaba r. 



Stems lax ; leaves scattered, widely spreading, broadest at the middle, 

 less than I cm. long ; sporophyls sirriilar. 23. Z. tenuicaule. 



Plants elongate, 35-80 cm. long; leaves lax, with less conspicuous midribs, 



long-tapering. 



Leaves straight or slightly arcuate, 1.5-3 mm - wide > with inconspicuous 



midribs. 2I - Z « ^ifolittm. 



Leaves strongly arcuate, widely spreading, narrow (1 mm.), with con- 



spicuous midribs ; sporophyls short (8 mm. ), slender. 



22. Z. Jenmani. 



Leaves twisted throughout their entire length, widest at base. 



II. Z. taxi folium. 



