THE YAN YEAN RESERVOIR, VICTORIA. 47 
The oogonia of the Australian form were solitary or binate, and not 
infrequently a single oogonium terminated the filament. Not only is typical 
O. monile known from Victoria, but three distinct forms of it are known to 
occur in Australia, The present form is distinguished from them all by the 
narrower and more elongated dwarf-males. It should be compared with 
forms of O. Borisianum, (Le Cl.) Wittr. 
4. Окросохісм VICTORIENSE, G. S. West in Victorian Naturalist, xxii. 
(1906) p. 22. 
Oc. dioicum, nannandrium, gynandrosporum ; oogontis singulis, ellipsoideo- 
globosis vel ellipsoideo-doliiformibus, poro superiore apertis ; oosporis exacte 
globosis, oogonia non complentibus, episporio glabro ; androsporangiis 5-6- 
cellularibus ; nannandria in cellulis suffultis sita, stipite curvato, antheridiis 
internis bicellularibus ; cellulis suffultis levissime dilatatis. — (Text-fig. 6, C.) 
Crass. cell. veget. ...... 25-29 ш; altit. 2-3-plo major ; 
„ООО. лье и: . 97 ш: 
5»  O08pOT. ,........ BO wi y 99 ш: 
,  androsporang... 25-20 p; „ {7-8и; 
4 cell. antherid.... Cop: „‚ FO. 
Hab. Tn а shallow pool in the Yan Yean drainage area (Oct. 1905). 
This species is perhaps nearest to O. crassiusculum, Wittr., but differs in 
its solitary oogonia and exactly globose oospores, the latter by по means 
filling up the former. The nannandria are also much more eurved and the 
antheridia two-celled. From О. macrandrium, Wittr., it is distinguished 
by the greater thickness of its vegetative cells, by the solitary oogonia with 
a superior pore, and by the relatively smaller size of the oospore. Itis also 
gynandrosporous, whereas 0. macrandrium is not. О, victoriense should 
also be compared with O. cataractum, Wolle. 
Order CHZETOPHORALES. 
Family ULOTRICHACEZ. 
Genus ULOTHRIX, Аи. 
5. ULOTHRIX IDIOSPORA, spon. (PL 2, figs. 12-14.) 
U. in ciespitibus parvis inter alias algas aquaticas reperta ; filis vegetativis 
subflexuosis, cellulis diametro 2-21-plo longioribus; chromatophora parva 
parietali leviter lobata, eum pyrenoide singulo conspicuo ; sporis solitariis 
vel seriatim. dispositis, ellipsoideis, doliformibus, vel elongatis et subeylin- 
dricis, diametro cell. veget. majoribus, membrana crassa, grosse et irregu- 
lariter scrobiculata. 
