384 Fritsch, Observations on the young plants of Stigeoclonium Kütz. 
5. Summary. 
A brief summary of the more important results, published in 
this paper, is added: 
1) In species of Stiyeoclonrum, possessing well-developed hairs, 
these usually begin to develop at a very early stage. 'The same is 
the case with the branching, which becomes apparent at an early 
stage, if the adult plant is at all strongly branched. 
2) The development of the base varies very much in the different 
species and also to some extent within the limits of each species. 
In some cases it may be quite absent, the young plant being then 
attached by a specially modified basal cell, frequently aided by 
rhizoids subsequently. j 
3) This latter type of young plant has not previously been 
properly described. It must be regarded as arising by a third mode 
of development, differing from the two, previously described by 
Berthold. 
4) The formation of rhizoids varies in abundance in the different 
Species. 
5) The cells of the protococcoid groups, frequently arising by 
the degeneration of the Stigeoclonium-tilaments, are capable of grow- 
ing out directly into a new plant, as Famintzin had already 
shown. 
6) Under-certain conditions the filaments of Stigeoelonium may 
become encased in a wide mucilaginous sheath; this does not in- 
volve any displacement of the cells of the filament. 
7) A new yarlety (var. simplex) of the S7. farctum of Berthold, 
characterised chiely by the absence of branchinge in the upright 
filaments, is described. 
8) The close resemblance between such epiphytic species of 
Stigeoclonium and the species of MHerposteiron, which have been des- 
cribed as pussessing distinetly septate hairs, is shown. Itis my be- 
lief that these latter plants äre merely stages in the life-history of 
epiphytic Stegeoclonia. 
9) Certain endophytic and epiphytic forms, apparently belonging 
to the genus Endoderma Laag. are described, namely a large-celled 
and a small-celled form. The possibility of a connection between 
the former and st. nanum is suggested, whilst the cells of the latter 
form were found to grow out directly into true Stigeoclonium- 
filaments. 
Finally it remains for me to express my obligations to my friend 
Mr. L. A. Boodle F. L. S., who has been kind enough te examine 
many of the forms, depieted in my figures, and to discuss with me 
my interpretation of them. 
Jodrell Laboratory, Kew,, Bo Rritsch. 
November 20th, 1902. 
