180 NEMATOPHYCE^E. 



Conferva zonata, Web. & Molir. in Ag. Syst. p. 90 ; Harv. 

 Man. 126. Eng. Fl. v., p. 351. Alack. Hib. 224. Dillw. 

 Conf. Syn. p. 41. Johnst. Fl. Berw. ii., 254. Gray AIT. i., 

 311, 



Conferva lubrica, Dillw. Conf. t. 47. 



Conferva lucens, Eng. Bot. i., t. 1655 ; ii., t. 2475. 



In ditches, ponds, swamps, &c. 



Plate LXIX. fq. a. } , 



7 > 1 breads in ordinary condition. 

 j " J 



,, c. Portion of a thread with one macrozoospore 

 in each cell showing the red spot. 



,, d. Macrozoospores free with four cilia. 



., e. Macrozoospores in the resting state. 



M f. Macrozoospores germinating. 



, g. Plantlet of six cells. 



h. Threads with ripe microzoospores. 



,, h2. With macro and microzoospores. 



i. Microzoospores free with two cilia. 



,, k. Microzoospores in conjugation. 



-, /. Eesting zygospores, the result of the conju- 

 gation of pairs of zoospores. 



j, m. Portion of threads with growing plantlets 

 arising from nncopulated microzoospores 

 left behind in the mother-cells. 



n. Three healthy zygospores, 8 months and 9 

 days old. 



,, o. Zygospore contents differentiating. 



11 p. ,, in a later stage. 



q. very large in two positions, show- 



altogether 10 zoospores. 



,, r. , , with zoospores elongated. 



Hormiscia aequalis. (Kutz.) Rabli. Alg. Eur. in., 363. 



Yellowish-green, cells equal, or a little longer than their 

 diameter ; cell-membrane, rather thick. 



var. catenaefoarmis. Kutz. 



Kather thicker than in the typical form ; cells a little longer 

 than their diameter ; cell membrane thick, striate, manifestly 

 constricted at the septa. 



SIZE. Cells -012--018 mm. diam. 



Ulotlirix cequahs, Kutz. Tab. Phy. ii., t. 89, f. 1. Kirch. 

 Alg. Schl. 76. 



Ulotlirix catena for mis, Kutz. Tab. Phy. ii., t. 89, f. 2. 



In ditches and streams (mostly rapid) attached to aquatic 

 plants. 



Plate LXX. fig. 2. Portions of threads of Hormiscia catcnceformis 

 X 400 diam. 



