1 86 Phillips . — The Development of the Cystocarp 
renders it difficult to find any evidence of conjugation of the 
carpogonium with either cell. 
Delesseria Hypoglossum, Lamx. 
The ordinary vegetative thallus of D. Hypoglossum pro- 
liferates regularly from the midrib, and there is never any 
such forking by marginal growth as is found in D. alata. The 
lateral veins which are so marked a character of the vegetative 
thallus of D. sangninea , and which occur more obscurely in 
D. alata , are absent from this species. The segments which 
bear the reproductive organs are otherwise indistinguishable 
from the ordinary vegetative segments : hence it would appear 
that this species is a still less specialized form than D. alata. 
The apical growth has long since been accurately described 
by Naegeli (’47). Owing to the great obliquity of the cell- 
divisions in the lateral pericentral cells, the apical region 
presents a beautiful appearance which does not occur in any 
other British species of the genus. I have found this character 
useful in distinguishing this species from D. ruscifolia with 
which it is sometimes confounded in herbaria. 
The hyphal filaments which occur along the midrib in 
D. sangninea and D. alata , and which in the older parts 
greatly obscure the primitive arrangement of the cells, do not 
seem to occur in D. Hypoglossum , at any rate at the corre- 
sponding stages. 
The cystocarp-bearing plants occur only very rarely on 
the coast of Anglesey. Goodenough and Woodward (1795) 
contrast the east and west coast of England in this respect. 
According to these authors, it was only cystocarpic plants 
that had in their time been found on the coast of Norfolk. 
I have already ('96) referred to the case of Plumaria elegans. 
While I could never find female plants of this species on 
the coast of Anglesey or Carnarvonshire, I found them fre- 
quent at Sidmouth. Again, it is well known that Laurencia 
obtusa and L . pinnatifida rarely occur as cystocarpic plants 
in British waters. Mr. A. H. Church, who was good enough 
to send me cystocarpic material of D. Hypoglossum and other 
