202 



COMPENDIUM OF GENERAL BOTANY. 



tioii. Among mosses the sexual generation (6^ is prominent^ it 

 forms tlie independent green plant ; the asexual generation ( U)^ 

 which forms asexual s]3ores, does not even have an independent 

 existence ; it exists, so to speak, as a parasite upon the leaf}^ moss- 

 jjlant fonning the Hporogoniumn (moss-capsule, spore-fruit). 

 Among vascular cryptogams the large leafy plant constitutes the 

 asexual generation, while the minute green, short-lived structure 

 called \\\Q])rothnllium^ represents the sexual generation upon which 

 the archegonia and antheridia are formed. 



In regard to the structure of the sporangium of mosses, I will 

 state that the capsule of most liverworts contains spores in the 

 internal axial space, while in the leafy mosses the spore-bearing 



area takes a more perijihe- 

 ral position, that is, between 

 the sterile central column 

 (columella) and the wall of 

 the capsule. For the present 



Fig 



II. — Funnria 

 metricti. 



Jiygro- 



FiG. 125 T. — Funaria hygromeirica. 



Three stages of the developing sporogonitim 

 (//'); bb, ventral portion, /t, neck, of sporo- 

 gonium. The base ibb) forms the calyptra 

 c (C). (^ X 500, iJ and C X -lO.) (After Sachs.) 



A, Shoot hearing an immature sporo- 

 gonium, 3, with calyptra c, upon 

 the capsule. B, Nearly mature sporo- 

 gonium; /, capsule with calyptra c; 

 s, seta (stem). C, Longitudinnl sec- 

 tion of sporogonium; cc\ columella; 

 s, spore-forming layer; h, air-cavity; 

 a, the ring (aimulus) below the lid 

 (operculum); p, "'peristome." (After 

 Sachs.) 



we will omit further particulars. Figs. 125 I and 125 II, as 



