The Polymorphy of Cutleria multifida (Grev.). 
BY 
ARTHUR H. CHURCH, B.A., B.Sc., 
Jesus College , Oxford: Demonstrator of Botany in the University . 
With Plates VII, VIII, and IX. 
S INCE the classical researches of Falkenberg 1 , carried out 
at Naples in 1878, in which he showed the necessity of 
fertilization for the oospheres of Cutleria multifida (Grev.), 
and established the identity of the product of germination of 
such sexually-produced spores with Aglaozonia reptans (Kutz.), 
but little has been done to clear up the mystery underlying 
his conclusion that Cutleria must therefore present an anti- 
thetic alternation of generations, in which Cutleria multifida 
represents the gametophyte, while Aglaozonia reptans is to be 
regarded as a true sporophyte-generation. 
Conclusive evidence of such an alternation of generations 
would be of greatest theoretical interest ; not so much from 
its being the only example described in the Phaeophyceae 
of an antithetic alternation at all comparable with the phe- 
nomena occurring in the Coleochaetaceae and the Florideae, 
1 Die Befruchtung und der Generationswechsel von Cutleria: Mittheilungen 
aus der Zoolog. Stat. zu Neapel, vol. i. 1879. 
[Annals of Botany, Vol. XII. No. XLV. March, 1898.] 
