THE CLUB-MOSSES 



545 



Fig. 373. — Mountain Selaginella (Sdagindla heh'etaci, SelaHinclla Family, 

 ScUiginellacece) . A, sporophyte, {. B, young sporophj'te growing 

 from macrospore. (Bi.gchoff.) — Native home, Eurasian mountains. 



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

 sium (a) containing three macrospores, and a microsporangium (b) 

 discliarging numeroii.s microspores, Y. (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 {b, 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. ' 



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

 ■ Mac'ro-spore < Gr. makros, large. 



