54 



Frond, an organ which combines stem and leaf; or stem, leaf, and 



fruit, as in ferns. 

 Hypnospores, spores that germinate after a long period of rest or 



sleep. 



Macrospores, spores that produce a prothallus having organs cor- 

 responding to ovaries. 

 Microspores, small spores that produce a prothallus with organs 



corresponding to anthers. 

 Prothallus, a minute plant formed by the first growth of the 



proper spores, and from which the ordinary plant grows after the 



fertilization of the archegonium. 

 Sporange, a box or case in which spores are formed and come to 



maturity. 

 Spores, proper, are commonly separate, single, minute cells which 



germinate to a prothallus, though in some cases they have two or 



more compartments 

 Swarmspores, ciliated, self-moving bodies which escape in swarms 



from a mother cell. Sometimes they vegetate to form new plants. 



Sometimes they are pollen-like in their office; and sometimes 



they unite two and two to form true spores or sporanges. 

 Thallus, a leaf-like expansion of cellular tissue without a definite, 



symmetrical form. 

 Teleutospores, the final spores produced by a plant which has 



passed through a regular cycle of generations, the spores tlmt 



are to recommence the cycle. 

 Zoospores, spores or spore-like cells capable of moving themselves 



by means of vibratile cilia. 

 Zygospores, spores formed by the union of cells of different plants 



or of two zoospores. 



125. Having roots, or hair-like organs corresponding to roots, and a 

 stem or a rhizome bearing leaves or branches. With rare excep- 

 tions green, and living on inorganic matter. Aeroguns. 126 



Having no true roots, no central axis of growth, and no plain dis- 

 tinction of stem and leaves. Sometimes existing through liie as 

 a single cell. Commonly consisting of variously-shaped expan- 

 sions of mere cellular tissue, with no fibro-vascular bundles, the 

 f/ni/lus. Simple or branched. In some cases bright green. More 

 commonly red, purple, brown, dull green, or colorless. 



