THE CLUB-MOSSES 



545 



Fig. 373. — Mountain Selaginella (Selaginella helvetaci, Selaginella Family, 

 Selaginellacecp). A, sporophyte, }. B, young sporophyte growing 

 from macrospore. (Bischoff.) — -Native home, Eurasian mountains. 



Fig. 374. — Mountain Selaginella. Part of cone, showing a macrosporan- 

 gium (a) containing three macrospores, and a microsporangium (6) 

 discharging numerous microspores, ^^. (Schenck.) 



Another large group is Selaginella (Fig. 373) the sporo- 

 phytes of which often resemble those of the club-mosses so 

 closely that they were at first included in the same genus, 

 and many forms in cultivation are still called by florists, 

 lycopodiums. A most significant though inconspicuous 

 difference is that Selaginella has two kinds of spores — minute 

 ones, called microspores,^ which are very numerous in anther- 

 like sacs termed microsporangia (6, Fig. 374); and macro- 

 spores - (a) which are so large that four fill a macrosporangium. 

 Both kinds of sporangia are borne singly on the stem just 

 above or in the axils of upper leaves, in the same branch or 

 cone. 



1 Mi'cro-spore < Gr. mikros, small. 



2 Mac'ro-spore < Gr. makros, large. 



