949 



DESCRIPTION OF PLATES 



a, a', a 



b, V 



c 

 d 



(Expucatio icondm). 



cellula vel seniioellula a front© 



i» 



» 



»» 



»» 



i» 



»• 



a rertioe m 



later 



Tua. 



semicellula a basi vi»a, 



PLATE X. 



Kgr. 



1-4 



9J 



J9 



99 



» 



99 



W 



n-13 



16-19 



Herpost 



*/< 



N*g. x520. 



a 



is usual in preserved specimens of this 



oo\ oogonium from which the oosphere haa eaoaped 



brbtlet are broken off near 



Ute 



species* 



theridium 





£oni UTD 



5. Zygnema spontaneum Nordst 



6-8. Spi 

 9-10. 



X520. 



Ktitz. 



var. 



var 



99 



decimina (Miill. ) 

 orientate sp. n. x520. 9, vegetative cell; 

 with zygospores. 



620 



three female gameUngia 



>? 



,exilis sp. n. x520. 11, vegetative cell; 12 and la, putione of conju- 

 gating filaments. 



14-15. Mougeotia parvula Hass. var. ellipwidea var. n. x520. 



99 



producta sp. n. x520. 



PLATE XI. 



Fig, 



99 



99 



99 



5t 



** 



W 



1-2 



3-9 



10 



13 



CEdogonium oblongellum Kirchn. x520. an, antheridium; 



oo, oogonium 



Vaucheria orientate 



sp 



n. 3-5, x!20; 8 and f x520. at, antheridium; an 



developing antheridium; oo, oogonium; oo' 9 developing oogonium; fb % fructiferow 



branch. 

 Vaucheria globulifera sp. n. x520 an. antheridium; co 9 oogonium; oo*p 9 oosjjore. 



11-12. Ophiocytium elongatum sp. n. x 520. 



** 



cochleare A. Br. forma. x520. 



14-16. Microthamnion curvatum sp. n 



thallus. x 520. 

 17-21. Urococcus tropicus sp. n. x5 



Three branches isolated from a compact, •ttbrotund 



and 18. young plants; 19-21, older plants. 





PLATE XII. 



Kg 



99 



n 



»f 



J* 



» 



** 



*f 



l-4 # Hyalotheca Burmenm sp. n. x520. 

 5. Desmidium Aptogonum Br£b. v 



8-10. 



W 



Q. 8. Wei*. x520. 



6-7. Onyckonema 



17. 

 18, 



sp 



n. 



x 520. 



»> 



lave Nordst. x520. 9 and 10, svgosporei 



P) of larger form than 



fig. 8. 



11-15. Hyalotheca 



(Sm.) Breb 



x530. 



•getatire filament with vertical viewi 



of forma bidentula (fig. 11 *); *» d forma *n</^ 



showing formation 



aplanospores in the 



s*oeia 



16. Cosmarium 



99 



ff 



dichondrvm W. & G. S. We* var. Mexagonum 

 subprogram W. & <*• * West var. Quadrat 



subcrenatum Hantzsch forma x520. 



{fig. 11 f)\ 12 13, 

 o«l Lb. apt. aplanoepore. 

 var. n. X 20. 



var 



5i0 



Ann. Eoy. Bot. Gabd. Calcutta Vol. VI 



