MUSGI. 



355 



the old archegonium (h, Fig. 243, B and C), the lower end 

 penetrates into the tissues of the leafy axis ; the upper end 

 develops into a spore-case, while the remainder becomes a 

 filiform stalk (seta) of greater 

 or less length. In the Sphag- 

 nacece, however, the sporogo- 

 nium does not greatly elongate, 

 but, on the contrary, remains 

 quite short, while the end of 

 the leafy axis, soon after the fer- 

 tilization of the archegonium, 

 elongates into a slender leafless 

 stalk (pseudopodium}, which 

 carries up the developing sporo- 

 gonium upon its upper expand- 

 ed end (v, ps, Fig. 244, B and 

 C). Essentially the same 

 structure is found in Andrce- 

 acecB and Phascacece. 



464. The ripe sporogo- 

 nium (capsule, theca, or spore- 

 case) is of various shapes, but 

 generally more or less cylindri- 

 cal or globose ; it differs much 

 in its particular structure in 

 the different orders, but in all F 'g- 244. Development of the sporo- 



gonium of Sphaimmn aatOtfoHttm. A, 



Certain internal Cells become longitudinal section of a f,-male flower; 



., ,, i i j- ar > archegonla ; c/i. voiini; pericha'tial 



Spore mother-Cells, Which dl- leaves ; y, upper leaves of the shoot 



vide into four daughter-cells, SttSJni VTu 



the spores. The capsule, when & 



ripe, opens by the falling off of S 



a terminal lid (opercnlum) * e 



(SpllCUinacece and Briiacece), Or curved row of epore mother-cells. (7, 



. , , T, Sphagnum nquarros'im. sg, ripe sporo- 



111 a few Cases by Splitting ver- goninm; a, operculum; c, torn calyp- 



,t 11 / A 7 ' \ ,i tra ; gs, the elongated pceudopodium ; 



tically (Andrcvacece} ; in the ,*. p.-ftchietiai leaves. In ma |iifled.- 

 amaU order Phascacece the cap- Al 



sule is indehiscent, and the spores are set free only by its 

 decay or irregular rupture. The ripe spores are roundish 

 or more or less angled, and have a roughened or granulated 



