William J. Hodgetts. 
164 
The alga has since (in June) been found epiphytic on 
Cladophora glonierata growing round the sides of the pool in 
Victoria Park, Dudley Port, Staffs. In this locality, although it 
was rather rare, the alga showed precisely the same morphological 
features observed in the King’s Norton material, the filaments, 
however, apparently not attaining quite the same length as in the 
latter locality, being generally less than 3 mm. long. The attenu¬ 
ated basal cell was affixed to the Cladophora by a mucous pad 
which was always reddish-brown with iron compounds. The 
apical cell showed the same variety of forms already described, 
and was frequently more or less curved. In material which had 
stood in the laboratory for 24 hours the liberation of the 
macrozoogonidia was very finely observed, the procedure being 
exactly the same as in the specimens from the King’s Norton 
pond. It seems probable that the stimulus which caused the 
formation of zoogonidia was the slight rise in temperature caused 
by bringing the alga into the laboratory, as is the case, for instance, 
in Oedogonium. The only other algse observed on the Cladophora 
were many common Diatoms (Cocconeis Pediculus, Diatoma 
elongatum, Rhoicosphenia curvata, etc.), which appeared to be 
actively competing with the Uronema for the available foothold on 
the Cladophora , and a few filaments of Oedogonium. 
The present species differs from Uronema confervicolum 
Lagerh. 1 mainly in its longer filaments, the much longer cells, 
and in the chloroplast not occupying the whole length of the cell; 
in U. confervicolum the filaments do not exceed 1 mm. in length, 
the cells are 10-18/x long, 4-6 g wide, and the chloroplast extends 
the whole length of the cell. The var, javanica Mobius 2 of 
Lagerheim’s species differ little from the type. Uronema? sim- 
plicissimnm (Reinsch) Lagerh. 3 (=Stigeoclonium simplicissimum 
Reinsch 4 ) appears to be a doubtful species of Uronema; its 
filaments are 0'84—P2 mm. long, and the cells 8'4—9-7 g wide, 
those of the sterile filaments being twice as long as broad, while 
the filaments terminate in a hair. 
Since the present species has both its filaments and cells 
longer than those of either of the above two species it has been 
’ Lagerheim in Malpighia, 1, fasc. XII, 1887, p. 518 ; and in Notarisia, 
1888, p. 597 ; or see Chodat, l.c. pp. 266 and 272, and Fig. 187. 
‘ Mobius, Ber. Deutsch. Bot. Ges. XI, 1893, p. 118. 
* Lagerheim in Malpighia, I, fasc. XII, 1887, p. 522. 
4 Reinsch, Contrib. Alg. Fungol, I, p. 78; or see De Toni, Syll., Alg., 
Vol. 1, p. 176. 
