CLUB-MOSSES AND THEIR ALLIES. 141 



XIII. CLUB-MOSSES AND THEIR ALLIES. 

 L YCOPODINE^ . 



MATERIAL REQUIRED. 



Fresh specimens of Selaginella from the conservatory. A number of 

 species are common in cultivation, and any of them may be used. 



Club-moss, Lycopodium clavatum, L., with spore-bearing spikes. Simi- 

 lar specimens of other species of the same genus, e.g., L. lucidity 

 lum, Michx., L. complanatum, L., etc. 



Any other vascular cryptogams that are procurable, as Marsilia or 

 Jsoetes. 



SELAGINELLA. S. stolonifera, denticulata, etc. 

 General Characters. 



I. Record your observations of the plant as a whole. 

 Where did it grow, and under what conditions? Point 

 out any peculiarities of form, texture, or habit, by which 

 it would be readily distinguished from ferns. 



II. Examine carefully the mode of branching. Draw a 

 diagram to represent it. Is it dichotomous or monopodial ? 

 The plant is said to be bilateral and dorsi-ventral ; show 

 how this is true. How do you distinguish between the 

 dorsal and ventral aspect of the plant ? ^ 



III. Describe the form and arrangement of the leaves. 

 Are they all alike ? How many rows are there ? 



IV. On well-developed specimens, slender, root-like 

 organs, rhizophores, are to be found. Notice where these 



1 Cf. Strasburger, Practical Botany, p. 296. 



