THE YAN YEAN RESERVOIR, VICTORIA. 51 
3. MOUGEOTIA VICTORIENSIS, sp. п. (РІ. 2. fig. 1.) 
M. subparva, cellulis vegetativis diametro 91—14-plo longioribus, chroma- 
tophora elongata eum pyrenoidibus 2-7 (plerumque 5-6) in serie singula 
subirregulariter ordinatis ; cellulis conjugatis elegante genuflexis ; sporis 
globosis ; intra cellulas steriles parte inclusis, membrana glabra; circa 
sporam unamquemque et partes propinquas cellulze sterilium cum tegumento 
mucoso amplo sphærico. 
Crass, cell. veget. 11:5-12 ш; diam. spor. 21-24 №; diam. integ. mucos. 
60-63 р. 
Hab. Yan Yean Reservoir ; at the weedy margins (Nov. 1905). 
M. victoriensis is undoubtedly nearest to M. parvula, Hass., but is distin- 
guished by its slightly thicker vegetative cells, which are also somewhat more 
elongate, and by the large gelatinous envelope surrounding the spores. One 
other species of this genus is known with a wide gelatinous coat enveloping 
the spores, namely, M. gelatinosa, Wittr. (т Wittr. & Nordst. Alg. Exsic. 
(1889) no. 957, fasc. 21, pp. 26, 27 сит fig.). This species, which I have 
examined from both England and Scotland, differs much from the Australian 
plant in the thickness of its vegetative cells and in the form of its spores. 
Moreover, the mucous coat of the spore is usually interpolated between the 
spore-wall and the adjacent parts of the conjugating-tube, whereas in 
M. victoriensis the mucous coat envelops not only the spore but also the 
adjacent parts of the gametangia (the sterile cells of W ittrock). The con- 
jugating-tube of M. victoriensis is relatively much wider than that of 
M. parvula ог М. gelatinosa, and the spores are partially immersed in the 
gametangia. 
The gelatinous coat surrounding the spore of M. victoriensis is almost three 
times the diameter of the spore itself, and is commonly enerusted with 
minute particles of mineral and organic detritus. 
Genus DEBARYA, Wittr. 
10. DEsAnvA Hanpvr, sp. п. (РІ. 2. figs. 6-11.) 
D. inter alias Conjugatas intermixta ; cellulis vegetativis 9-16-plo lon- 
gioribus, pyrenoidibus 2-4 in seriem unicam dispositis in chromatophoro 
uroquoque ; zygosporis ubi conjugatione scalariformi productis, quadratis, 
lateribus rectis vel levissime concavis interdum incrassatis, angulis incrassatis 
et cornutis, cornubus cylindricis et solidis e semigamitangiis reliquis formatis ; 
membrana cornu delicatissime lamellosa. 
Crass. cell. veget. 64—7:5 р; diam. zygosp. (sine corn.) 22:5-27 y. 
Hab. Found sparingly amonst Zygnema spontaneum, Gonatozygon mono- 
tænium, ete., at the weedy margins of the Yan Yean Reservoir (Jan. 1906). 
This is the narrowest described species of the genus Debarya, and in 
outward appearance presents тапу resemblances to Mougeotia gracillima. 
E 2 
