384 



MOSSES AND FERNS 



CHAP. 



not seen at all, and the origin of the young sporophyte was un- 

 mistakal)ly non-sexual. Prothallia, arising directly from the 

 leaf, or from the sporangial receptacle, were found to be a com- 

 mon phenomenon in the same species. 



The ScHiZyEACE.E (Dicls (i)) 



The SchizcTace?e include about sixty species Monging to 

 five genera. The very characteristic sporangia have a terminal 

 annulus, which forms a sort of crown at the apex. Some of 

 them, like Schizcca pnsilla and T radio ptcris clcgans, are very 



^- B. 



Fig. J-J2. — A, Prothallium of Ancimia Phyllitidis, Xi8o; B, female; C, male, prothallia 

 of Scliicaea pnsilla, X30 (A after Bauke, B, C, after Britton & Taylor.) 



small and delicate plants. In the largest species of Lygo- 

 cliuiii the slender twining fronds may reach a great length. Ac- 

 cording to Hooker (2), the New Zealand species L. articu- 

 latiun, may reach a length of 50 — 100 feet. 



The Gauictophytc 



According to Bauke (2), the prothallium in Lygodium, 

 Aneimia, and Mohria is much like that of the Polypodiaceae, 

 except that in tlie two latter genera (Fig. 222), the growing 

 point is at one side. Tlie spores are tetrahedral, and contain 

 no chlorophyll until after germination has begun. The germ- 



