472 
Transactions of the Society. 
*3. CE. obsoletum Wittr. Y. Go. 
*4. CE. zig-zag Cleve. 
Vegetative cells slightly thicker and spermogonia bicellular. 
Crass, cell, veget. 19-23 ,u; altit. 2£-4-plo major; 
,, oogon. 53-57 fi ; „ 50-55 /jl ; 
„ cell, spermogon. 19 fu; „ G-7‘5 jx. 
II. Ha. 
*5. CE. nobile Wittr. II. Ha. 
6. CE. paludosum (Hass.) Wittr. III. C. 
*7. CE. oblongum Wittr. II. Wh. 
8. CE. platygynum Wittr. VIII. L. 
*9. CE. obtruncatum Wittr. 
(E. dioicum, nannandrium ; oogoniis 4-continuis, globoso- 
ellipsoideis, oosporis oogonia complentibus ; nannandribus ob- 
longo - pyriformibus, curvatis, unicellularibus, in oogoniis 
sedentibns. 
Crass, cell, veget. 17-20 n ; altit. 4-5-plo major ; 
„ oogon. 48-53 ju ; ,, 48-53 ju ; 
„ oospor. 47-52 ^; „ 47-51 ju; 
„ cell, suffult. 20 ju ; 
„ nannandr. 9-5-14 ju. 
II. Wh. 
This plant comes nearest to the partially described (E. obtruncatum , 
agreeing with it in all those characters mentioned by Wittrock. We 
therefore describe the additional characters observed in the specimens. 
10. CE. undulatum (Breb.) A. Br. VIII. W. 
*11. CE. cyathigerum Wittr. II. Ha. 
12. CE. Braunii (Kiitz.) Prings. II. Ha. 
13. CE. macrospermum sp. n. (PI. VII. figs. 6, 7.) 
CE. dioicum, nannandrium, oogoniis singulis, magnis, sub- 
depresso-globosis, circumscissilibus cum rima angustissima 
submediana ; oosporis subdepresso-globosis, oogonia complen- 
tibus, membrana glabra ; cellulis suffultoriis eadem forma ac 
cellulis vegetativis ceteris : nannandribus in cellulis suffultoriis 
sedentibus, paullo curvatis, bicellularibus (?) 
Crass, cell, veget. 13-13*5 /u ; altit. 4-5^plo major; 
„ oogon. 44-46 ju ; „ 39-40 ju ; 
„ nannandr. 11 -5^; „ 38 /u. 
II. Ha. 
The nearest species to this is CE. propinquum Wittr., from which 
it is distinguished by its slightly greater thickness and proportionately 
longer cells, its much larger oogonia and oospores, which are depressed, 
and the circumscissile oogonia. 
14. CE. macrandrum Wittr. I. Ep. 
15. CE. cardiacum (Hass.) Wittr., var. carbonicum Wittr. III. M. 
