Neomeris dumetosci , L amour. 
601 
Whether the preceding hypotheses as to the evolution of 
the leaf and gametangium of the Dasycladaceae will hold or 
not, I think it remains sufficiently clear that the subdivision of 
the Dasycladaceae into the two sub-tribes Acetabularieae and 
Dasycladeae, originally proposed by Hauck and followed by 
Cramer and Wille, may prove too artificial. Agardh alone 
has insisted on the morphological identity of the Dasycladean 
appendage, though his conception was that the most reduced 
leaf was the highest type, and thus he headed the series with 
Acetabularia. At any rate, as I have already pointed out, 
this is the line which primarily demands exploration, the old 
distinction between ‘ fertile leaf’ and c sterile hair’ resting on 
on satisfactory basis. 
The phylogeny of the group as thus indicated may be 
expressed in such a form as the following : — 
Cympolia 
Neomeris 
Bornetella 
Stage V. 
Stage IV. 
Polyphysa 
(?) 
Stage III. 
(?) Acetabuloides 
Halicoryne 
(?) 
Stage II. 
■Acetabularia medit. 
(?) 
Chlorocladus. 
(Proto-Dasycladus) 
Eudasycladus. 
Vaucheria. 
