318 



upper ends of the ramuli the diameter of the filaments decreases to 

 about 7 jti, the length of the cells being about ten times the breadth. 



The stichidia have a shorter or longer stalk and are placed 

 either near the base or somewhat higher up in the ramuli. They are 

 about 1B5 u broad. 



\Yhile the pericentral cells of this form were rather clearly visible 

 in transverse sections it was not so in the case of some other speci- 

 mens (my collect no. 2090). I want to mention these specimens in 

 this place, because, regarding their outer appearance, they bear a 



a 



Fig. 321. Dasya tnollis Harv. a, part of a branch with base 



of a ramulus (no. 2131). b, tranverse section of the thallus and 



c, part of a branch with base of a ramulus (no. 2090). 



(a, about 80:1, b, 60:1. c, 150:1). 



close resemblance to the above mentioned form. A transverse section 

 of a branch of this plant (Fig. 321 b ) shows a tissue of cells larger 

 in the middle, smaller outwards, the central and pericentral cells 

 not being visible; even in young branches these cells are not pro- 

 minent. The specimens differ, too, with regard to the size and con- 

 struction of the ramuli (Fig. 321 c) from the above mentioned form. 

 At their base the cells are about 30 ja thick only, and short, too, not 

 much longer than broad, growing gradually longer higher up in the 

 ramuli. The stichidia are placed near the base of the ramuli with a 

 single short basal cell only. This plant does most probably represent 

 another species, but having had so very little material of related 

 species or none at all at my disposal, I have not been able to make 

 any comparison and so I prefer to leave it be unnamed. 



