238 BOTANICAL GAZETTE [MARCH 
development. The antheridia usually form a neck cell before the 
regular antheridial divisions. 
INDIANA UNIVERSITY 
Bioomincton, Inp. 
- EXPLANATION OF PLATES XII AND XIII 
(Figs. 1-41 in text) 
PLATE XII 
All figures 660 
Fics. 42-46.—Stages in development of antheridia; fig. 44 shows orthodox 
form sometimes found, the others show more usual form with a neck cell. 
Fic. 47.—Fresh, mature spore. 
Fic. 48.—Spore with cell showing through ruptured coats. 
Fic. 49.—Spore with rhizoid showing first. — 
IGS. 50, 51.—Rhizoids issuing from the ot exposed by the rupture of 
the coats: og, oil globules. 
IGS. 52, 53.—First and second divisions of the prothallial cell. 
Fics. 54, 55.—Two rhizoids formed by the undivided spore. 
PLATE XIII 
All figures X75 
Fics. 56-64.—Photographs of living prothallia which, with many others, 
were taken at one time from one small bit of soil; only enough are shown to 
indicate the variation in form and growth. 
