M 
354 MONOGRAPH OF THE LABOULBENIACE^. 
On Gyrinusf raternus Coupy ^ud several undetermined species, New England; on G. ajffi 
Aubo, and G. ventralis Kirbj, Middle States; on G. analis Say, Missouri; on (r. confi 
if< 
France. 
Tills remarkable species is bj no means uncommon, and is so peculiar that it could by no 
chance be confused with any other species. A comparison of its younger stages shows that it 
corresponds in all essentials to the type structure of the genus, there being primarily a single 
insertion-cell above cells IV and \^, which are normally placed (figs. 32--34)5 while the appcnd- 
usual type. 
(fig. 34) 
posed 
cells, terminally more or less bilobcd, from which a certain number of branchlcts may arise; 
while the primary basal cell of the inner appendage by constant and successive division and 
proliferation forms the broad base of insertion characteristic of the mature plant. IIuw far cells 
IV and Y and the insertion-cell take part in forming this base through secondary divisions, the 
opacity of the plant in this region renders uncertain. Cells I and II arc sometimes quite elongate 
and very slender; but as a rule the general habit is such as is represented in fig. 31. The out- 
growths from the lip-cells are similar in a way to those occurring in Stigmatomyccs virescens. 
Tlicy are often irregular in form and frequently are but partially developed. L. cornuta is the 
only other species of the genus having a somewhat similar outgrowth from one only of its lii> 
cells. 
(fig. 36) 
lets tending to grow sideways in between the bases of the appendages. I have thus far been 
unable to determine the character of the antheridia in this species, and liave even been led to 
suspect that the antherozoids might be exogenous. It is quite uncertain, however, what their 
nature reallv la. ' 
nature really is. 
t e fee t,p of the aMomcn, often growing in dense tufls. The latter, like nil the other 
t,r' te!"""'. • ' ' "'""'"■' °^ *' P'"^^^"* S™"'' '^ ""» ^^■I'i^h swims on the surface of 
the wate., and ,s «ry eommon in ponds and ditches, or along the margins of strean.s. 
TERATOMYCES Thaxter. Plate X, figs. 1-17,- Plate H, fig, 1. 
Proc. Am. Acad. Arts „,„, Sd. Vol. XXVITI, p. ,«,; v„,. XXIX, p. 98. 
^.ucle consisting of three mmornncorT „ n 
stalk-cells. 
Anne„d.„, • 7""''='='=' o"" to several (five), symmetrical, with single 
ttedouTarr" ; ^ '''"' """ »' '-™''"^-l ''-->-. bearing sympodial 
Antl.e.d7a1ati r ' S k~' ff f "'""»'-^^' ''^^' ^'^'■^'o. te.^ninal cells. 
cal e..ternal row arisin. from tl Iw ' """ ""' '""'"'"■■' ^"''^^''"^'^^ "' » ^'"S'" ™'-"- 
branehed and septate, v'ronre- ntTt^"""'^ "' '"^ ^"P^""""''^- 'r"'^''"^^'- -"^'-^'^ 
% 
