158 



MANUAL OF BOTANY 



the stem of Lycopodium can be divided into two areas, composed 

 of thiok-walled woody cells with small intercellular spaces. 

 The cells of the inner area have very thick walls. The cortex 

 is crossed by bundles passing out from the stele to the leaves. 



The sporangia in Lycopodium and Phylloglossum are simple 

 and stalked. They arise on the leaves near their insertion 



Fig. 916. 



Fia. 917. 



Fig. 916. Longitudinal section of cone of Lycopodium^ showing the spoi-angia 



in tlie axils of the sporophylla. Fig. 917. Lycopodium annotinum. 



p. Prothallium. h The young plant, w. Its root. After Funkhauser. 



(fig. 916). They arise from several cells instead of from a single 

 one as in the ferns. They show no special peculiarity in their 

 development. The spores are all microspores. 



In Psilotum and Tmesipteris the sporangia are bilocular 

 or trilocular, being synangia, as in the Marattias. They are 

 stalked bodies, borne upon the upper surface of the bilobed sporo- 

 phyll at the junction of its two lobes. 



