STEIL: THE ANTHEROZOID OF THE GENUS RICCARDIA 199 
stained. Further studies of the development of the anther- 
ozoid will probably aid in determining the nature of the an- 
terior portion of the antherozoid, including the blepharoplast, 
1G. 2. An antherozoid 
of Marchantia salanaibho, 
27- 
which at an early stage in spermato- 
genesis appears as a small spherical 
y- 
Although no detailed study has been 
made of the manner of swimming of the 
antherozoid, some observations may be 
worthy of mention. When the anther- 
ozoid moves from point to point, it is 
in the form of a funnel, the larger end 
of the funnel being at the anterior end 
(Fic. 3). The antherozoid is constantly 
rotating in the free swimming condition. 
Antherozoids were observed to remain 
motile for more than thirty minutes after 
they had been set free from the anther- 
idia 
Many more male gametophytes of Riccardia pinguis were 
found in the vicinity of Madison in the spring of 1920, and 
from preparations obtained at this time 
the observations made the previous year 
were confirmed. 
In the spring of 1921, a supply of 
male plants of Riccardia pinguis was 
obtained from Mr. Severin Rapp, of 
Sanford, Florida. Although there were 
some minor morphological differences 
between these male plants and those 
growing in this locality, the antherozoids 
of the two forms were exactly alike. 
For several years Riccardia multifida 
has been found growing on decaying 
wood in the same general region as Ric- 
cardia pinguis. (Gemmae were produc 
Fic. 3. An anthero- 
zoid of Riccardia pinguis 
in the free-swimming con- 
dition, XK 1527. 
ced 
abundantly by these plants, but antheridial branches were at 
no time discovered. Further observations could not be made 
on these plants since the species apparently disappeared from 
this locality where it was once found in abundance, 
