106 Rhodora [APRIL 
+ + Oospores not adherent to mouth of oogonium. 
M. macrandra, Lagerheim (as var. of M. polymorpha). Normally 
diclinous. Holma, Sweden. 
In addition to these forms Prof. Lagerheim describes two doubtful 
species, M. ovigera and M. regnigens. Of these the first seems a 
very doubtful Monoblepharis while the second should, I think, cer- 
tainly be excluded from the genus. A form closely resembling it was 
found at Kittery Point in the spring of 1896 in a permanent pond; 
but although the material was just beginning to produce zoospores, I 
had no opportunity to determine whether the latter were uniciliate, 
or to ascertain whether the sporangia were proliferous as in M. 
regnigens. The hyphae, however, have the characteristic vacuolate 
contents which so clearly distinguishes members of this family, and 
we are probably dealing here with a new genus. 
What I assume to be M. polymorpha is the most abundant species 
and can be found in almost any pond or swamp, being no doubt very : 
widely distributed. The filaments are very slender with divergent 
branches often much attenuated. The oogonium-like sporangia are 
very common, and the oogonia are more frequently solitary, or not 
more than two or three together, in marked contrast to the succeed- 
ing species. 
M. brachyandra, which is distinguished by a shorter stouter anthe- 
ridium, differently placed and arising characteristically from an 
abruptly distinguished notch-like insertion which breaks the even 
outline of the oogonium, is further peculiar from the common occur- 
rence of intercalary antheridia of the type shown in fig. 1o. The 
spores tend to nearly smooth forms in the material examined, and I 
have been unable to distinguish the two varieties described by 
Lagerheim, the characters of which seem to be combined in the 
American material. I think, however, that there can be little ques- 
tion as to the identity of the Swedish and American forms. The 
zoosporangium represented in fig. rr is unusually elongate and is 
drawn from fresh material killed and stained just as the zoospores 
were escaping. The antheridium which it bears is also abnormally 
elongated. The usual form of these sporangia is exactly like that of 
the oogonia. 
M. macrandra, which is regarded by Lagerheim as a variety of M. 
polymorpha, I have never met with. It seems to be so well distin- 
