728 AQUATIC PHYCOMYCETES 



Antheridia epigynous, that is, appearing to be inserted on the 



oogonia M. polymorpha, p. 733 



Oogonia always conspicuously beaked, mostly cylindrical ; oospores 

 constantly endogenous, generally ellipsoidal ; antheridia always 

 epigynous ; hyphae generally coarse, straight, rigid and scarcely 

 branched, up to 23 \l in diameter 

 Oospores smooth; sex organs in fascicles, linearly arranged or 

 singly at tips of the hyphae 

 Sex organs in fascicles 



Oospores 21-25 \x by 18 \x M. fasciculata 



wax. fasciculata, p. 735 



Oospores 28-32 \x by 23 \i M. fasciculata var. magna, p. 736 



Sex organs linearly arranged, basipetal, or single at the tips of 

 the hyphae 

 Oospores 30^4-0 ;jl by 23-32 u. . . . M. insignis var. insignis, p. 737 



Oospores 23-25 \x by 20-21 \x M. insignis var. minor, p. 737 



Oospores bullate; sex organs in fascicles, linearly arranged or 



singly at the tips of the hyphae M. bullata, p. 740 



Sexual reproduction unknown 1 



Sporangia narrowly cylindrical, frequently proliferating 



M. regignens, p. 741 



Sporangia more ovate, rarely proliferating M. ovigera, p. 741 



MONOBLEPHARIS SPHAERICA Corntl 



Bull. Soc. Bot. France, 18: 59. 1871 ; Ann. Sci. Nat. Bot., V, 15 : 82, pl.2, figs. 1-6 



1872 



Non Monoblepharis sphaerica Cornu emend. Woronin, Mem. Acad. Sci 

 St. Petersb., Phys.-Math. CI. VIII, 16: 1-24. 1904. 



Mycelium well developed, consisting of cylindrical, somewhat rigid, 

 rather frequently branched hyphae, 1-2 mm. long by 4-6 [jl in diameter; 

 oogonia subspherical to spherical, usually arranged singly at the tips 

 of the hyphae and their branches, occasionally borne in fascicles at the 

 tips of the branches, less frequently in a series alternating with hypog- 

 ynous antheridia, varying in length from 21 to 31 \x (majority 23 \i), 

 diameter 19-27 \x (majority 21 \x)\ antheridia narrowly cylindrical, 

 hypogynous, always present, usually opening by a slightly exserted tube 

 approximately 2 ix long, formed just below the oogonial cross wall 



1 The two following species may belong in Monoblepharella or they may be 

 distinct from that genus as well as from Monoblepharis. Final disposition will de- 

 pend on their type of sexual reproduction, if any. 



