﻿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 ocalamites. 



Family 4. — -Calamariaceae. C alamo dendr on, Eu- 

 catamites. 



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 25. ELIGULATAE. 



Order Lycopodiales. Gametophyte much larger 

 than the spore; sporophyte with a central vascular 

 bundle; spores uniform (isosporous) . 



Family 1. — Lycopodiaceae. Lyco podium, Phyllo- 

 glossum. 



Family 2. — Psilotaceae. Psilotum, Tmesipteris. 

 CLASS 26. LIGULATAE. 



Order Selaginellales. Sporophyte stem with a 

 central flbro-vascular bundle incapable of thickening ; 

 spores of two kinds (heterosporous). 



Family 3. — Selaginellaceae. SelagineUa. 



Order Lepiodophytales. Sporophyte stem with a 

 central fibro-vascular bundle and thickening by a corti- 

 cal meristem. Palaeozoic and Mesozoic trees, long 

 since extinct. 



