68 1.YC0P0DALES. [Acrogexs. 



Alliance V. — LYCOPODALES. — The Lycopodal Alliance. 



Diagnosis. — Vascular Acrogens, with axillary or radical orte — or raany-celled spore-caseSf 

 and spores of two soHs. 



The fomiation of leaves, which in the Muscal Alliance had become complete, is in this 

 group carried stiU further ; for the leaves are now capable of generatmg spore-cases in 

 their axils. That tendency to form spiral vessels wliich in Muscales is confined to the 

 cellular tissue, vnth. the single exception of the Horsetails, is now a characteristic of 

 this Alliance, the axis containing in all cases spiral tubes in abvmdance. The larger of 

 the Clubmosses seem to imitate Coniferous GjTnnogens in their manner of growth, and 

 in theu' tendency to collect their spore-cases in cones. The Pepperworts e\'idently 

 exliibit an approach to that system of converting leaves into seed-vessels wliich is so 

 generally characteristic of flowering plants. Here too it would seem that we have a 

 great approach to the manner in which sexual organs are formed in the more perfect 

 classes. 



NATURAL ORDERS OF LYCOPODALS. 



Spore-cases 1-S-celled, axillary; reproductive bodies similar . . 21, Lycopodiace^. 

 Spore-cases many-celled ^ radical {or axillary); reproductive bodies "(^ .-^.^ ■. , 



dissimilar 



J- 



