BIBLIOGRAPHY. 
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figures of a new species of Ectocarpus , E. Reinboldii, characterized 
by the form of the sporangia which are borne in a more or less 
secund manner on the lateral branches, and are oval-cylindrical, 
sessile, or more rarely shortly stalked or intercalary, the compart- 
ments swollen outwardly and each perforated by a hole through 
which the zoospores escape, and of Pogotrichum filiforme the type 
of a new genus closely related to Litosiphon , Harv. ; the filaments, 
however, frequently consist of a single row of cells, which is 
never the case in that genus. In addition to these the following 
species are dealt with in detail : — Stilophora rhizodes , Ehrh., sp., 
S. tuberculosa , FI. Dan., sp., Halorhiza vaga, Kuetz., Chordaria 
flagelli formis, FI. Dan., sp., Chordaria divaricata , A g., Rhodo- 
chorton minutum , Suhr. (I?. minutissimum , Suhr., on plate). 
Sphacelaria cirrhosa , Roth., sp., S. racemosa, Grev., var. arctica. 
a S', olivacea , Dillw., sp., S. plumigera , Holmes, S. plumula, 
Zanard, Stypocaulon scoparium , /. spinulosum, Kjellrn., and 
Chcetopleris plumosa, Lyngb., sp. 
Note sur quelques Ectocarpus. By E. Bornet (Bull, de la Soc. 
Bot. de France, 1892). — Despite the fact that all the observers who 
have studied the Ectocarpi agree in stating that the spores from 
either of the forms of sporangia germinate freely without having 
previously conjugated, it is usual to say that the plurilocular 
sporangia of this genus are gametangia, and the unilocular, 
zoosporangia. Dr. Bornet reminds us, however, that this generali- 
zation is based on but three observations bearing upon two species, 
that the authors do not agree as to the way in which it is accom- 
plished, and that many facts have been recorded which tend to 
show that the reproduction of the Ectocarpi is neither so simple 
nor so uniform as has been represented. In Ect. secundus , for 
example, in addition to the usual sporangia, bodies which there can 
be little doubt are really, antheridia, also occur. These antheridia 
contain antherozoids, which are much smaller than the spores 
contained in the plurilocular sporangia and in most respects are 
closely analogous to the antheridia of Tilopteris, etc. In Ect. 
pusillus, Griff, (which according to the author is identical with 
Askenasky’s E. ostendensis) on the other hand the plurilocular 
sporangia contain a few large, motionless spores about 20 p in 
diameter. If, then, we attempt to find a place for these two species 
in the classification of the Ph^eosporese proposed by Kjellman in 
his “ Handbok ” we would be compelled to place E. secundus 
among the Gynocratse and remove it from the true Ectocarpi, 
while a new order, the author suggests Acinetosporece, intermediate 
between the Ectocarpeae and Tiloperideae, would have to be made 
for the reception of E. pusillus, Griff., which would in that case 
become the type of a new genus Acinetospora. At present, how- 
ever, the author considers it better to adopt Thuret’s view that the 
first place should be given to morphological, not physiological 
characters, in which case the genera Ectocarpus and Tilopteris, 
which are so closely related in most respects, need not be separated 
