292 ESSENTIALS OF BOTANY 
373. Form and Structure. — The general appearance of 
many species of Lycopodium is very similar to that shown 
in Fig. 218. Selaginella is most familiar to people who are 
not botanists from the species often grown in greenhouses. 
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Fic. 213. Plant of Lycopodium (L. annotinum). 
It has somewhat the appearance of a large leafy moss-plant, 
with the leaves arranged in four rows. 
The structure of the stems and leaves of the club- 
mosses is somewhat complex. They have well-developed 
fibro-vascular bundles with sieve-tubes. 
374. Reproduction ; Heterospory. — In Lycopodium the 
leafy (asexual) plant produces an immense number of 
