Drv. i 



THALLOPHYTA 



473 



cavities are formed later and the sperraatia arise on very small and thin stalks 

 from the cells lining the cavities (Anaptychia, Physcia, Stictd). The spermatia, 

 embedded in a slimy mass, are shed from the spermo- 

 goiimm and conjugate with the adhesive tip of the 

 trichogyne (Fig. 4295). After conjugation the 

 or y^/" spermatia appear empty and their nucleus has dis- 



appeared. When this has taken place the cells 



Fn ;. 427. Cladonia cocci/era, 

 t, iScales of primary 

 thallus. (Nat. size.) 



B 



Fio. 428. Cladvnia rangiferina. A, sterile ; B, with 

 ascus-fruits at the ends of the branches. (Nat. 

 size.) 







FIG. 42'.'. Collemacrispum. A, 

 carpogonium (c) with its 

 trichogyne (0 ( x 405). B, 

 apex of the trichogyne 

 with the spermatium (.s) 

 attached (x 1125). (After 

 E. BAUR.).' 



FK.. 430. Anaptychia ciliaris. Ripe spermogoniuin. The 

 dark round bodies within the thallus are the green algal 

 cells, (x 192. After GLUCK.) 



of the trichogyne collapse, while the cells of the coiled carpogonium swell, 

 undergo divisions, and form the ascogonium. From the latter the ascogenous 

 hyphae which bear the asci are produced. The vegetative hyphae composing 



