45 



by walls and in Fig. 28 d the newly divided cells begin to grow 

 out at their uppermost end. 



As I have pointed out in my earlier paper the cell contents 

 have also a marked disposition to be divided into balls (Fig. 29) ; 

 this formation of balls seems mostly to take place when the fila- 

 ments are hurt in some way. These balls can grow out to new fil- 

 aments; most often 

 I think they serve 

 as a kind of apla- 

 nospores. 



Now and then 

 upon the inner-wall 

 of the filaments 

 some small lenti- 

 form cells occur re- 

 minding one some- 

 what of those found 

 in Valonia (Fig. 29) ; 

 also from these cells 

 branches can grow 

 out. 



At their base 

 the filaments are 

 fastened to the sub- 

 stratum by means 

 of shorter or longer, 

 more or less ra- 

 mified rhizoids (Fig. 

 30 a) and Clado- 

 phoropsis membra- 

 nacea has further- 

 more some attach- 

 ment organs very 

 like the tenacula 

 found e. g. in Striwea, Boodlea etc. These tenacula-like rhizoids 

 (Fig. 30 b, c) are found not only at the base of the filaments 

 but often also higher up growing out anywhere in the filaments, 

 often in the middle of the cell at a long distance from any cross 

 wall. They have sometimes a wall at their base most often not. 

 But never, or in any case very seldom^), do they grow out from 



^) Only in one of the many gatherings I have examined of Clad, membra- 

 nacea, namely, one from St. Thomas growing on rocks in exposed 



Fig. 30. Cladophoropsis menibranacea (Ag.) Bargs. 

 a, rhizoids near the base of a filament; i and c, 

 tenacula: d, small piece of a fUament with a young 

 shoot and a rhizoid (a, 20:1; h and e, 30:1; d, 15:1). 



