246 
0 . S. West and Olive E. Hood. 
Other Species of Trentepohlia Examined. 
Trentepohlia aurea (L.) Mart. Both living and fixed material 
of this species were examined. The cell-wall is lamellose, the 
lamellae showing up clearly on treatment with strong sulphuric acid. 
The latter are less divergent than those of T. Montis-Tabnice var. 
ceylanica, and each newly-formed lamella extends proportionately 
further down the lateral walls. The extreme apex of the wall also 
consists of several lamellae and is much thicker and stronger than 
in T. Moutis-Tabulce var. ceylanica. Only the older lamellae, are 
broken through in the growth of the apical cell., several of the newer 
Fig. 6. Apices of three filaments of T. aurea. x 800. A, shows a very 
irregular and much elongated apical cap. B, apical cell with a laterally 
displaced apical cap. C, end of filament showing three successively displaced 
apical caps (da', da 2 , da 3 ). 
layers increasing in area at the same time. This is very similar to 
the mode of growth described by Schmitz 1 and also by Strasburger 2 
in the marine alga Bonietia secundiflora. 
The cell-wall consists entirely of cellulose. 
The apical secretions of pectose are again present, but they 
are not the bonnet-shaped caps previously described. They do not 
1 Schmitz. “ Bildung und Wachstum der pflanzlichen Zetl- 
membran,” Sitzungsber. der neiderrhein. Ges. fur Natur. u. 
Heilkunde zti Bonn, 1880. 
5 Strasburger, “ Ueber Bail und Wachstum der Zellhiiute,” 
Jena, 1882, p. 189. 
