180 BOTANICAL GAZETTE [MARCH 
6. Burck, W., Vorlaufige Mittheilung iiber die oe des 
Prodhaiiieas von Aneimia. Bot. Zeit. 33:499-501. 1875. 
: , Sur le développement du prothalle des iietonte comparé a celui des 
autres ous Archives Néerlandaises 10:416-442. pls. I1-13. 1875. 
8. CHAMBERLAIN, CHAs. J., Methods in plant histology. 1905. 
go. GorpeLt, K., Zur Keimungsgeschichte einiger Farne. Ann. Jard. Bot. 
Buitenzorg 7:74-116. pls. 10-13. 1888. 
to. ———, Archegoniatenstudien, I. Flora 76:104-116. pls. 8-11. 1892. 
Ir. ———,, Organography of plants, II. 1905. 
12. HEIM, Gist, poeenanees iiber Farnprothallien. Flora 82:329-386. 
_ figs. 16. 1896. 
13. Kny he Entwickelungsgeschichte des Vorkeims der Polypodiaceen und 
IE AR Report in Bot. Zeit. 2'7:46. 1869. 
, Ueber Bau und Entwickelung der Farnantheridiums. Monatsh. 
Konig. Preuss. Akad. Wiss. Berlin 1869:416-430. /l. 1. 
15. Lanc, W. H., On apogamy and the development of sporangia upon fern 
prothallia. Phil. Trans. Roy. Soc. London B 1go: 189-238. pls. 7-11. 
1898 
. THomson, R. B., The megaspore membrane of gymnosperms. Univ. of 
Toronto Studies, Biol. vies no. men pp. 64. pls. 5. 1905. 
Woronew, Einfluss der ren Bedingungen auf das Keimen der 
Sporen und Wachen der Prothaltion Abstr. in Tsr's Bot. Jahrb. 221:176- 
177. 1894. 
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EXPLANATION OF PLATES X AND XI 
Reference letters: a, rhizoid; e, epispore; ex, exine; g, granules which form 
epispore; 7, intine; , nucleus; #, 9’, prothallial cells; 7, red portion of exine; J, 
yellow portion of exine. 
PLATE X 
Lygodium circinatum 
Fic. 1:—Tetrad. X 1050. 
Fic. 2.—Portion of spore wall and tapetal protoplasm with elie and 
nucleus. X 1050. 
Fic. 3. Bend dpi sho in the formation of granules. X 1050. 
FIc. 4. with granules adhering to form the epispore. %1059- 
FIG. 5. Riana of granules and tapetal protoplasm when spores are 
mature, showing irregular size and distribution of granules. X 1050. 
Fic. 6.—Portion of wall of mature spore, showing epispore with projections 
of varying size and irregular distribution. X 1050. 
Fic. 7.—Portion of spore wall, showing epispore pulled away from the exine; 
but _ view is oblique so that the epispore appears wider than it really is. %105°- 
G. 8.—Portion of spore wall with intine pulled away. 1050. 
Rie G. 9.—Germination of spore showing rhizoid emerging. X 300. 
