78 



Class 111. LYCOPODIINAE. Clurmosses and Quillworts. 



A. Isosporous. Leaves without ligula. (Plate 12 ; Fig. CO.) 



Gen. 42, 43. \i. Lycopodiaceae 



1). Heterosporous. Terrestrial. Leaves with ligula. Stems very slender. 

 (Fig. 60.) 



Gen. 44. 13. Selaginellaceae 



C. Heterosporous. Aquatic. Stems condensed into a short caiulex. 

 Leaves grass-like, with ligula. (Fig. 61.) 



Gen. 45. 14. Isoetaceae 



Fig. 59. Lycopodium. 1, ] 5. L. carolinianum L. 1. Plant. 3, 4. Sporophyll with 

 sporangium. s- Spore. 2. L. davatum L. Long, section of a sporangium. 

 (Fig. 2 from Engler and Prantl, the others from nature.) 



