180 NEMATOPHYCES. 
Conferva zonata, Web. & Mohr. in Ag. Syst. p. 90; Harv. 
Man. 126. Eng. Fl. v., p. 351. Mack. Hib. 224,  Dillw. 
Conf. Syn, p. 41. Johnst. Fl. Berw. ii., 254. Gray Arr. i., 
311. 
Conferva lubrica, Dillw. Conf. t. 47. 
Conferva lucens, Eng. Bot.i., t. 1655; ii., t. 2475. 
In ditches, ponds, swamps, &c. 
7 4 Threads in ordinary condition. 
» ¢. Portion of a thread with one macrozoospore 
in each cell showing the red spot. 
Plate LXIX. fig 
+, dd. Macrozoospores free with four cilia. 
s» @ Macrozoospores in the resting state. 
»» jf. Macrozoospores germinating. 
» g. Plantlet of six cells. 
»» A, Threads with ripe microzoospores. 
»,» 4&2. With macro and microzoospores. 
»» 2%  Microzoospores free with two cilia. 
» &. Microzoospores in conjugation. 
» d. Resting zygospores, the result of the conju- 
gation of pairs of zoospores. 
s» m. Portion of threads with growing plantlets 
arising from uncopulated microzoospores 
left behind in the mother-cells. 
» 7”. Three healthy zygospores, 8 months and 9 
days old. 
1, 0. Zygospore contents differentiating. 
1 Dp. § in a later stage. 
» Qe si very large in two positions, show- 
altogether 10 zoospores. 
n ae with zoospores elongated. 
Hormiscia equalis. (Kiutz.) Rabh. Alg. Eur. 111., 363. 
Yellowish-green, cells equal, or a little longer than their 
diameter; cell-membrane, rather thick. 
var. cateneformis. Kutz. 
Rather 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. 
Ulothrix equalis, Kutz. Tab. Phy. ii., t. 89, f. 1. Kirch. 
Alg. Schl. 76. 
Olothrix cateneformis, 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 cateneformis 
x 400 diam. 
