A BOTANICAL EXCURSION IN MY OFFICE. 527 
themselves ‘generally on the emptied cell (Fig. 3), 
Sometimes on the sporangium, and soon grow into a 
Fig. 3. peculiar two-celled little plant. The 
base of the first of these cells is 
enlarged into a roundish, disk-like 
part, which is attached to the anchor- 
age, and is known as the foot. It 
is the distal of the two cells in which 
are formed the male germs, the so- 
called spermatozoids. These are little 
i bodies very similar to the zoéspores, 
ein. female plant but much smaller, and almost desti- 
oriy anda dwarf ‘male tute of color. They are similarly cil- 
plant on i ge emp cell. 5 
opi Fo male ‘pla an mts by iated, and have sim- Fzt 
innod spore; c, opening ilar powers of loco- 
r: A cell motion. 
been used fh making the r 
ee e 
ize). at they are per. 
fected. tone is formed a lateral open- 
ing in the proximal or lower part of 
the sporangium of the resting spore. 
Through this orifice one or more of 
these spermatozoids enters and im- 
pregnates the endochrome, which con- 
tracts itself still more, and matures 
into the fully formed resting spore. $ 
During its maturation its green color AE P seite ‘ptint 
changes into a reddish-brown, and it magnified about Jin ain 
acquires two coats, the outer of which wim granular protoplasm 
is very thick and provided with a cu- direction eira 
rious spiral band or marking. (Fig. 5.) Se ea peel 
The exact way in which germina- tle abov 
tion of the resting spores takes place in the genus 
