67 



Uber den Ban unci die Forpflanzung von Halicystis Aresch. iind Valonia 

 Ginn. (in Bot. Zeit., 1907). 



Valonia segagropila ,3 elongata C. Ag., Spec. Alg., p. 430. 



Conferva diaphana West e specim. in Herb. Vahl in Museo Bot. Hau- 

 niensi (cfr. G. Agardh, 1. c). 



From an examination of my rich material of this interesting 

 plant I have arrived at the result that, even if it is in several 

 regards nearly related to Valonia, it nevertheless shows important 

 differences approaching 

 it to several other genera 

 e. g. Apjohnia, Siphono- 

 cladus etc., for which rea- 

 son I have thought it most 

 suitable to consider it as 

 representing a new genus. 



Before pointing out 

 the w^ays in which it shows 

 likeness with and dilTer- 

 ences from the above-men- 

 tioned genera, I shall give 

 a description of the plant. 

 As is the case with so 

 many related forms our 

 plant when young consists 

 of a single clavate cell for- 

 ming the basal stalk of 

 the older plant. This at its 

 base is fixed to the ground 

 by irregularly ramified and 

 septated rhizoids (Fig. 

 53 a). The wall of the cells in the rhizoids is thick and' much 

 starch is found in the cells. Also the wall in the stalk itself, in 

 any case in older plants, is rather thick in its lower part and here 

 some annular corrugations occur, most strongly developed lower- 

 most (Fig. 53 a), leaving only a small passage open in the middle 

 of the cell. 



In its broadly rounded, sometimes even a little swollen, 

 uppermost end the clavate stalk bears a bundle of branches most 

 often five to eight but sometimes up to a dozen or more (Fig. 52). 

 These branches are quite like the mother-cell, clavate, thinnest 

 at their base. Here, in any case when they grow older, we find 

 a single swelling (Fig. 53 b, c). The branches are separated by 



Fig. 52. Ernodesmis verticillata (Klitz.) Borgs. 

 Part of a plant. (About 4:1). 



