380 Fritsch, Observations on the young plants of Stigeoclonium Kütz. 
If the species, which I have described on p. 9 and 10, be 
compared with the epiphytic species just discussed, it will be seen. 
that it does not agree absolutely with any one of them. It 
comes nearest to the Sig. faretum of Berthold, differing from it 
chiefiy in the absence of branching in the upright filaments and in 
the relatively small number of upright branches formed; nor de 
according to Berthold these vertical filaments in Stiy. farctum 
normally terminate in hairs, although septate hairs were formed at 
the ends of the majority of the upright branches in his cultures. 
Nevertheless there is a great resemblance between my form and 
St. farctum Berth. and I therefore propose to establish it as a 
variety of Berthold’s species. In consequence of the absence of 
branching in the upright filaments I shall call it S7. faretum Berth. 
var. simplex nov. var. 
Some of Cienkowski’s figures (76%, Pl. I, fig. 9) indicate a 
development of the basal portion equivalent to that of the species 
just discussed; and it would seem as though the base is not rarely 
considerably developed in Stigeoclonium, although this is not always 
connected with a reduction in the vertical portion, as in Strg. farctum 
var. simplex. 
4. Certain other forms (in part endophytiec) possibly 
"connected with Stigeoclontum. 
In the introductory remarks mention has already been made ot 
the fact that species of Stigeoclonium have been observed to occur 
in intimate connection with certain endophytic forms (cp. P. 3). 
Huber (92®, p. 274—278) describes at considerable length a species, 
found growing in and on Zemna gibba. The epiphytic portion, 
whose filaments could however also penetrate into the cells of the 
Lemna and there form an „agglomeration compacte de cellules vertes 
(Pl. VIII, fig. 6),“ was in the fully-developed state indistinguish- 
able from Steg. tenue Rabh. The true endophytic portion, con- 
sisting of large cells, could not be definitely included in the life- 
cycle of the epiphytic portion just described. Huber once observed 
the emission of zoospores from one of these large cells; on germi- 
nation they gave rise to „Alaments tres minces, qui correspondent 
probablement a l’etat epiphyte“ (loc. eit. p. 277). 
T'he epiphytie portion, the vertical flaments of which were in the: 
adult branched state so much like St. tenue Rabh., has a base 
(Huber, Pl. 8, fie. 7) not unlike that of the St. farctum, described 
above. Except for the occurrence of the large endophytic cells, 
(whose connection with the epiphytic portion can scarcely be regar- 
ded as definitely established), there is indeed little to distinguish 
Huber’s form from the other epiphytic species of Stigeoclonium. 
For the fact of its being occasionally endophytie is nothing very 
striking. The Stig. pygmaeum of Hansgirg (86, p. 69), which 
this author ineludes in the genus Eindoclonium, there regarded as a 
sub-section of Stigeoclonium, is according to him occasionally also 
endophytic in the plants, on which it is generally only an epiphyte. 
Hanseirg, in later (93, p. 217) uniting his species to St. furctum 
