92 THE JOURNAL OF BOTANY 
toM. Renvagesn, the only localities where al three plants are known 
to be co-existent. A new species of Aglaozonia—A. melanoidea—is 
described, et the author is of opinion Nhat. this is ‘lone the 
sporophyte of Cutleria adspersa, instead of A. chilosa, as has been 
supposed. The two generations A. melanoidea and C. adspersa are 
found side by side in the same depth of water at Guéthary and 
at Tangier, while A. chilosa does not occur in either locality. ‘If 
by zoospor ke ersa solely by oospheres, either partheno- 
zenstio or fertilized, aia the io plants live Gots at Guéthary, 
it seems more logical to admit their mutual dependence.” Granted 
that this is the case, the author acknowledges that the same diffi- 
culty arises for the Naples plants, where C. adspersa and A. chilosa 
occur; but they do not grow near each other, and it is reasonable 
at first the case at Guéthary. There remains therefore one sporo- 
phytic form for which no oophyte has yet been found—viz. A. chilosa 
—and M. Sauvageau suggests that it may belong to either C. com- 
pressa or C. pacifica; always. supposing that it is not a variety of 
sia ew nor a form in the life-cycle of Zanardinia. 
ird chapter deals with ‘‘ The germinations which grow m 
aatiro on Cutleria adspersa at Guéthary.” M. Sauvageau recog- 
nizes three forms of germination id ti oophytic generation, which 
enominates as ‘‘forme Fa erg,” ‘forme Thuret,” and 
‘forme Church,” after the preg who first described them. In 
* forme Falkenberg ” the germinating spore produces a small 
upright column of cells (‘ wiieauctie eo P hich bears one or more 
exogenous hairs, and adheres to the substratum by means of 
rhizoids. This is the Keimfuss of Prof. Falkenberg, but M. 
Sauvageau prefers the name ‘colonnette,” to avoid confusion 
between this upright portion and the 4 - era thalla us, which 
shortly develops at its base. The baal cells of the ‘ colonnette” 
e nlar args and proceed to divide, till they scot a prostrate thallus, 
a 
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bel ow. The column is for : a7 persistent, but is liable to be 
broken off through its delica M. Sauvageau believes that these 
‘*formes Falkenberg”’ are the remull of parthenogenetic germination 
of the oosphere of Cutleria adspersa, and are the origin of Aglao- 
zonia melanoidea, since the germination of the unfertilized Spapnare 
result. ‘ Forme 
which is the meristematic z This produces cells which pee 
the thallus below, and r eilase. those which are broken off abov 
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