*SHOW The Lycopodiales of the British Isles 
- 30 December 2003. 
 
*CHARACTER LIST 
 
#1. <common name:>/
 
#2. <synonyms:>/
 
#3. stems <elongation>/
       1. elongated, with numerous small leaves/
       2. short and tuberous, with sheathing leaves crowded in dense
          rosettes/
 
#4. stems <carriage>/
       1. suberect, and rooting <directly> at the base only/
       2. creeping, and rooting directly at intervals along their
          length/
       3. creeping, and rooting from characteristic, leafless,
          root-bearing branches (rhizophores)/
 
#5. stems <length>/
       cm long/
 
#6. stems <manner of branching>/
       1. overtly dichotomising vegetatively/
       2. ostensibly monopodial vegetatively <owing to unequal
          development from the original dichotomies>/
 
#7. stems <whether dorsiventral>/
       1. dorsiventrally organized, with four ranks of leaves/
       2. not dorsiventrally organized <implicit>/
 
#8. stems <whether with flattened branches>/
       1. with non-flattened branches/
       2. with only slightly flattened branches/
       3. with strongly flattened branches/
 
#9. stems <presence of secondary thickening>/
       1. with anomalous secondary thickening <via a cambium external to
          the primary phloem, producing small quantities of vascular
          tissue centripetally, and generating centrifugally large
          quantities of so-called prismatic tissue, comprising a mixture
          of xylem, phloem and parenchyma>/
       2. without secondary thickening/
 
#10. the old leaf bases <in \i{}Isoetes\i0{}, persistence>/
       1. persistent on the stem, short and blackish, each with two long
          points/
       2. not persistent/
 
#11. leaves <whether ligulate>/
       1. ligulate/
       2. eligulate/
 
#12. leaves <arrangement>/
       1. 4-ranked on the branches/
       2. not 4-ranked/
 
#13. <foliage> leaves <heterophylly>/
       1. of two kinds: those of the two ranks on the upper side of the
          stem appressed and directed towards the stem apex, and those
          of the two lower ranks larger and spreading laterally/
       2. all alike and spirally arranged <implicit>/
 
#14. <foliage> leaves <length>/
       mm long/
 
#15. <foliage> leaves <appressed or spreading>/
       1. appressed/
       2. spreading/
 
#16. leaves <whether hair-pointed>/
       1. with long, filiform hair-like tips/
       2. not hair-pointed <implicit>/
 
#17. <heterosporous or homosporous>/
       1. homosporous <sporangia and spores all alike>/
       2. heterosporous/
 
#18. sporophylls <modified or leaflike>/
       1. resembling the foliage leaves/
       2. differing markedly from the foliage leaves/
 
#19. sporophylls <arrangement>/
       1. aggregated into well defined terminal cones/
       2. in fertile zones tending to alternate with sterile zones along
          the stems, rather than in well defined terminal cones/
 
#20. cones <carriage>/
       1. sessile at the tips of the normal shoots/
       2. on long, erect peduncles which bear distant, appressed,
          scale-like leaves/
 
#21. the sporangia/
       1. basal and subsessile on the adaxial surfaces of the
          sporophylls, non-septate/
       2. very large, transversely and longitudinally septate and
          embedded in the leaf bases/
 
#22. the megaspores <of Isoetes, surface ornamentation>/
       1. covered with short, blunt tubercles/
       2. covered with long, fragile spines/
       3. with a reticulate ornamentation, neither tuberculate nor
          spiny/
 
#23. <terrestrial or aquatic:>/
       1. terrestrial <implicit>/
       2. aquatic/
 
#24. <habitat elevation:>/
       1. lowland/
       2. upland/
       3. montane/
 
#25. <habitat when terrestrial:>/
       1. bogs/
       2. heaths/
       3. sandy places/
       4. rock ledges/
 
#26. <distribution in the British Isles:>/
 
#27. <general comments:>/
 
#28. family/
       1. Lycopodiaceae/
       2. Selaginellacae/
       3. Isoetaceae/
 
#29. abbreviated taxon name:/
 
#30. <illustrations:>/
