1903] Thaxter,— Notes on Monoblepharis 105 
safe to assume that they are to be looked upon as ¢he characteristic 
sporangia of the group. Although it would certainly add greatly to 
the already sufficiently remarkable peculiarities of this genus did its 
members possess, not only two kinds of sporangia, resembling anthe- 
ridia on the one hand and oogonia on the other, but also two 
varieties of zoospores ; the sporangial nature of the antheridium-like 
type may well be doubted until indubitable evidence has been 
obtained in corroboration of Lagerheim's observations. 
The species of Monoblepharis appear to the writer to form so well 
defined and coherent a group that it seems undesirable to follow 
Lagerheim in subdividing it into genera, or even subgenera: for, 
although the forms may be conveniently sorted according as they 
mature their oospores within (endogynous) or without (exogynous) 
the oogonia, such an arrangement would include M. insignis and M. 
fasciculata in the same. section with M. spherica, which is evidently 
more closely related to the exogynous M. polymorpha. Recognizing 
then but a single well marked genus, the species may be summarized 
as follows: ; 
MONOBLEPHARIS Cornu. 
* Oospores normally endogynous. 
+ Oospores smooth. 
M. insignis Thaxter. Oogonia large normally superposed in single 
series. Vicinity of Cambridge, Mass., and of Kittery Point, Me. 
AM. fasciculata Thaxter. Oogonia small, fasciculate at the tips of the 
hyphae. Vicinity of Cambridge. 
+ + Oospores bullate. 
M. spherica Cornu. Antheridium hypogynous. Vicinity of Paris, 
France. 
* * Oospores normally exogynous. 
+ Oospores adherent to mouth of oogonium. 
M. polymorpha Cornu. Normally androgynous the antheridia inserted 
above the middle third of the oogonium. Vicinity of Cambridge 
and of Kittery Point. Vicinity of Paris, France and of Breslau, 
Germany (Figs. 7-8). 
M. brachyandra Lagerheim. Normally androgynous, the antheridium 
arising from an abruptly distinguished insertion below the upper 
third of the oogonium. Vicinity of Cambridge. 
