SUPPLEMENT. 297 



To be inserted at page 91 



Spirogyra velata. Nordst. Lund. Univ. Arsskrift, 1872, Vol. ix. 

 Sterile cells with the ends truncate, 3-4 times as long as 



broad, chlorophyll band single, making 1^ to 2J tarns in the 

 spiral. 



Spores elongated-oval, polymorphous, 1 J to 3 times as long 

 as broad ; epispore thick, composed of four membranes ; the 

 second is hyaline and scrobiculate ; the third is coloured 

 (Nordstedt). 



Sporiferous cells a little swollen or not at all, sometimes 

 shorter, sometimes a little longer than the spores. 



SIZE. Cells 035--04nim.; zygospore -06 x -035 -085 X 

 045 mm. 



Petit Spirogyra, p. 25, t. 7, fig. 1-5. 



In ditches. 



England (Leicester. F. Bates). 



The zygospore has a broad hyaline border finely denticulate with the 

 scrobiculations of the second membrane. 



Plate CXXX. Jig. 1. a , sterile cells X 200; b, sterile cell x 400; 

 <?, fertile cells with zygospores X 200 diam. ; d, e, f, zygospores with the 

 investing cells X 400 diam. 



At page 165, after (E. capillare, add 



(Edogonium capilliforme. Kutz. Spec. 367 (?). 



Oogonia single, a little swollen, obversely egg-shaped, open- 

 ing with a superior pore ; oospores ellipsoid-globose or cylin- 

 clrically globose (almost four-angled in optical section), not 

 filling the oogonia ; male plants a little more slender than the 

 females ; spermogonia 2-10 celled, alternating with the vegeta- 

 tive cells; terminal cell obtuse. 



SIZE. Cells of female -03--034 mm., 1 J to 3 times as long ; 

 of male '024--02S mm., ]^ times as long ; oogonium -042--048 

 x 051--062 mm; oospore '037--045 x -04--05 mm., usually 

 039--04; sperm, coll -02--025 x -008--01 mm. 



Wittr. Mon. (Edog. p. 31. Kutz. Tab. Phyc. iii., t. 37, f. 

 8(7). 



In pool and ditches. 



Britain (Leicester. F. Bates). 



Plate CXXIX, fig. 4. a, female filament with oogouia X 400 diam. j 

 fc, male cells with alternating spermogonia X 400 diam. 



2 T 



