THE YAN YEAN RESERVOIR, VICTORIA, 
show that zygospore-formation normally takes place during the vernal phase 
of their life-history. 
| Five species of Mougeotia were observed with spores, one, M. viridis, in 
October, and the other four in November, This is again strictly comparable 
with the conditions under which fruiting takes place in the British Isiands. 
Especially interesting is the first production of spores by Mouyeotia viridis. 
In the British Islands this is almost invariably 
the first species of the genus 
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DESMIDS TABELLARIA FLOCCULOSA 
ZYGNEMACEÆ —— —— — 
COCCONEIS PLACENTULA - + + + ~ + + + + 
(C ООСОМ!АСЕ № ——.— poe VANHEURCKIA VIRIDULA 
6000090000000 
Chart showing the periodicity of some of the more important Chlorophyceæ 
and Diatoms of the Yan Yean littoral region. 
to enter into the fructiferous condition in the spring. 
water-temperature of 5°-7° € 
1 
It begins its spore- 
formation in the Midlands and the Southern countries in March, with a 
.; and in the more mountainous areas of the 
Pennine Chain, the English Lake District, and North Wales, fructification 
commences in April or May according to the state of the weather. 
It must be distinctly understood that this period of spore-formation is 
not necessarily the period of maximum vegetative growth of the species, 
which varies much according to conditions of enyironment. 
LINN. JOURN.— BOTANY, VOL. XXXIX. 
In the upland 
D 
