THE FERN BULLETIN 



73 



CLASS 24. CALAMARINEAE. 



Order Calamariales. Palaeozoic plants, often 

 of tree-like aspect and dimensions, long since extinct. 

 Stems, hollow, jointed; leaves mostly narrow distinct; 

 sporophylls in cones, each sporophyll with one or more 

 heterosporous sporangia. 



Family 3. — Protocalamariaceae. Aster o catamites. 



Family 4. — Calamariaceae. Calamodcndron, Eu- 

 ca I a mites. 



Phylum XL LEPIDOPHYTA. The Lycopods. 

 Chlorophyll-green, terestrial plants, exhibiting two 

 generations in each life cycle, viz : (1) the gametophyte 

 which is small and short-lived, and (2) the sporophyte 

 which is large, with roots stems and leaves and long- 

 lived. Stems of the sporophyte solid, not jointed, erect 

 or creeping; leaves relatively small, scattered or 

 crowded upon the stem. 



CLASS 2:>. ELIGULATAE 

 Order Lycopodiaj.es. Gametophyte much larger 



than the spore; sporophyte with a central vascular 



bundle; spores uniform (isosporous) . 



Family 1. — Lycopodiaceae. Lycopodium, Phyllo- 



glossum. 



Family 2. — Psilotaceae. Psilotum ) Tmesipteris. 

 CLASS 26. LIGULATAE. 



Order Selaginellales. Sporophyte stem with a 

 central fibro-vascular bundle incapable of thickening; 

 spores of two kinds (heterosporous). 



Family 3. — Selaginellaceae. Sclaginclla. 



Order Lepiodophytales. Sporophyte stem with a 

 central fibro-vascular bundle and thickening by a corti- 

 cal meristem. Palaeozoic and Mesozoic trees, lone 

 since extinct. 



