dEDOGONIACE^E. 157 



pore in the fissure, viewed from above stellate, witli 7-10 rays, 

 the depressions between the rays deep and rounded ; oospores 

 globose, not filling the oogonium ; spermogonia 1-2 celled, 

 terminal cell obtuse or apiculate. 



SIZE. Cells -008--01 mm. by 3-6 times as long ; oogonia 

 034--03S x 032--04mm. ; oospore -022--023 X 022--023mm. ; 

 sperm, cell -008--009 x '009--015 mm. 



Wittr. Mon. (Edog. p. 16. Kirch. Alg. Schles. p. 53. 

 Archer, in Quart. Journ. Micr. Sci., 1866, p. 63, Eabh. Alg. 

 Eur. iii., 352. 



Ireland, Scotland. 



This minute species Mr. Archer had found several times, and often 

 showing its pecnliarly-lobed oogonium, but he had never found the male 

 fructification ; he believed the plant must turn out to be a dioecious 

 species ; he had sometimes noticed a minute notch-like depression on 

 the upper outer margin of the oogonium, probably indicating the " micro - 

 pyle." He drew attention to the character, not adverted to by De Bary, 

 that the apical or terminal joint of the filament possessed a short acute 

 spine or macro. This in old plants, frequently is not to be seen, as the 

 terminal joint, or, indeed, considerable portions of the filaments, often 

 become detached, and chiefly in a young condition only are the plants 

 found entire. Quart. Journ. I. c. 



Plate L1X. fig. 3. (Edogonium Itzigsohnii, with oogonia and oospores; 

 #, transverse section of oospore x 400. 



b. Oospores subellipsoid. 



(Edogonium excisum. Wittr. 8f Lund., in Wittr. (Edog. Nov. p. 3, 



t. I,/. 1-4. 



Oogonia single, biconically-oblong, median processes 9, 

 rounded, small, oogonia deeply cut round (circumscissile), 

 vertical view orbicular, margin slightly undulated ; oospores 

 ellipsoid, as if constricted in the middle, not filling the 

 oogonium. Spermogonia 1-2 celled, subepigynous or hypo- 

 gynous, terminal cell obtuse, upper part of the filament curved. 



SIZE. Cells -0035--005 mm. by 5-6 times as long; Oogonia 

 013--015 x -018--025 mm.; oospore -009--012 x -015--018 

 mm. ; sperm cell -003--0035 x -006--007 mm. 



Wittr. Mon. (Edog. p. 16. Archer, Quart. Journ. Micr. 

 Sci., 1875, xv., p. 102. ' 



Ireland (rare). 



Plate LIX. fig, 4. (Edogonium excisum, with oogonia ; a, section of 

 oospore x 400. 



(Edogonium Archerianum, CooJce. 



Monoecious ; oospore elliptic, its wall marked by somewhat 

 coarse longitudinal ^trise, not filling the cavity of the much 



