SCHIZOXEUUA. 



Group PTERIDOPHYTA 

 (YASCULAE CRYPTOGAMS). 



Plants with a well-marked alternation of generations. The 

 sporophyte, or asexual generation, is conspicuous, and constitutes 

 ' the plant.' The sporophyte in nearly all cases is differentiated 

 into root, stem, and leaf, and has a well-developed vascular system. 

 From the asexually produced spore or spores, the gametophyte, 

 bearing the sexual organs, is developed. The gametophyte is 

 usually an inconspicuous and short lived thalloid body, without 

 vascular tissue. 



Classes 



(1) Equisetales. 



(2) Sphenophyllales. 



(3) Filicales. 



(4) Lycopodiales. 



Class EQUISETALES. 



Stems segmented into nodes and internodes ; branched or 

 unbranched. The leaves are borne in whorls at the node, and 

 are usually united into a sheath at the base. The sporaugia are 

 aggregate I in the form of cones or strobili, consisting of sporangio- 

 phores bearing sporangia with or without sterile bracts. 



The group Equisetales includes the recent genus Equisetum, 

 the 'Horsetails,' its sole riving representative, and fossils referred 

 to the genera Equisetites (plants closely similar in habit to 

 Equisetum), Schtzoneura, PJiyllotheca, Calamites, and Archceo- 

 calamites. The genera representing this group in the Glossopteris 

 flora are Schizoneura and Phyllotheca. 



Genus SCHIZONEURA, Schimper & Mougeot, 1844. 

 [Monogr. Plant, i'oss. Gres bigarre Yosges, p. 48.] 



The name Schizoneura was first proposed by Schimper & 

 Mougeot in 1814 for some specimens of Triassic age from the 

 Vosges. Brongniart had previously described similar specimens 



