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70 Veit Brecuer WIrTrrRocK. 
lateral process belonging to the supporting cell, which circumstance is occasioned 
by the fact that the transversal cell-wall, which has separated the branch process 
first formed from its mother cell, has been formed somewhat higher up in the branch 
process, not at its base.') The top branches are often bent like a sickle. The 
thickness of the cells varies hetween 85 and 125 uw. Their length is 7—25 times 
greater than the thickness. 
According to D:r GRUNOW’S opinion, directly communicated to me, both the 
forms now mentioned belong to Cladophora swnatrana v. Mart. (i. e. to Pithophora 
sumatrana (v. Mart.) nob.) ‘The one growing in brackish water D:r GRUNOW has 
determined as being a variety under the name of fuscescens. My opinion is also 
that these forms are nearly related to P. swmatrana (v. Mart.) nob. Whether 
they are quite identical with it can not be determined with certainty till they are 
known in a fertile state. The form grown in fresh water calls to mind P. equalis 
nob. almost more than P. swmatrana (v. Mart.) nob. 
1) The same circumstance sometimes takes place in P. polymorpha nob.; see pl. 1, 
figs. 15 and 17. 
