158 NEMATOPHYCE^. 



larger and elliptic oogonium; aperture of the oogoninm very 

 high up, being quite close to the annular striee of the caps. 



(Edogonium Pringsheimianum, Archer, in Quart. Journ. 

 Micr. Sci., 1868, pp. 295. 



Ireland. 



There being already a species bearing the name of (Edogonium 

 Prinffsheimii, which had priority, it became necessary to alter Mr. 

 Archer's specific name. We have not seen the species, and hence are 

 unable to furnish a figure. Unfortunately 110 measurements are given 

 with the above very brief description, which is a doubtful economy of 

 space. It is the only monoecious species with striate elliptical 

 oospores. 



SECTION n. Dioecious species. 



i 



A. Dwarf males unicellular. 



a. Oogonia furnished with verticellate median processes. 

 (Edogonium platygynum. Wittr. (Edog. Nov. p. 1. 



Gynandrosporous. Oogonia single (very rarely binate), de- 

 pressedly obverse egg-shaped, median processes 7-12, rounded; 

 oogonia cut round (circumscissile) below the middle, opening by 

 a pore seated in the fissure, vertical view -orbicular, margin 

 sinuate, \vith 7-12 (usually 8) depressions; oospores rather de- 

 pressedly globose, nearly filling the oogonium, androsporangia 

 1-3 celled; terminal cell obtuse. Dwarf males obverse egg- 

 shaped, small, seated on the oogonia. 



SIZE. Cells -006-01 mm., from 2-5 times as long ; oogonia 

 021--03 x 016-'024mm. ; oospore '017--024 x -015--02 mm. ; 

 androsp. cell -006--008 x '007--008 mm. ; dwarf males 

 0045--005 x -0085--0095 mm. 



Wittr. Mon. (Edog. p. 17, t. 1, f. 5-9. Kirch. Alg. Schles. 

 p. 53. 



Ireland. 



Plate L1X. fig- 5. CEdogonium platygynum, with oogonium ; a, trans- 

 verse section of oospore x 400. 



b. Oogonia destitute of median processes. 

 a Oospores globose or subglobose. 



(Edogonium Rothii. (Le Clerc.) Prings. Beitr. 69, t. 5, /. 4. 



Gynandrosporous. Oogonia single, or 2-6 continuous, glo- 

 bose, or rather depressedly globose, opening with a pore at the 

 middle. Oospores rather depressedly globose, almost filling the 

 oogonia. Androsporangia 2-4 celled, subhypogynous ; dwarf 

 males obversely egg-shaped, seated on the oogonia. 



SIZE. Cells -006--008 mm., 3-8 times as long ; oogonia 

 02--021 x '016--019mm. 



