rgto] TWISS—PROTHALLIA OF ANEIMIA AND LYGODIUM 181 
Fic. 1o.—Later stage, showing two papillae (prothallial cells). 300. 
Fic. 11.—Two prothaitial filaments coming from one spore. X 300 
Fic. 12.—Further Stage, showing relation of prothallial cells ana rhizoid. 
% 300. 
Fics. 13-15.— One method of development of thallus. 300. 
Fics. 16, 17.—Same stages in thallus developed in another way. % 300. 
1G. 18.—Third way of developing the thallus. X 300. 
PLATE XI 
Lygodium circinatum 
Fics. 19-22.—Later stages in development of thallus, showing terminal 
position of apical cell, and in jig. 22 the unequal size of the lobes. Fig. 19, X 300; 
jigs. 20, 21, X200; fig. 22, X50. 
Fic. 23.—Young antheridium with first wall flat. 700. 
Fic. 24.—Antheridium at mother cell stage, with first wall concave. 700. 
Fic. 25.—Antheridium with stalk. 700 
Fics. 26-28.—Development of ssthaaiedes X 300. 
Fic. 29.—Archegonium with remnants of four neck canal nuclei. X 300. 
dieda hirsuta 
Fic. 30.—Portion of spore wall. X 1050. 
Fic. 31.—Later stage of same. X 1050. 
Fic. 32.—Germination of spore. 300. 
Fic. 33.—Two prothallial filaments from one spore. X 200. 
Fic. 34.—Development of thallus. 300 
Fic. 36.—Still later stage showing lateral position of initials. 200. 
Aneimia Phyllitidis 
Fic. 35.—Later stages of development of thallus. X50. 
