Old specimens also become thicker and more indurated. The pores 

 also vary much as to size, as shown in our fig. 387. Comparing this 

 figure with the one previously published (Synopsis, Fig. 295) one 

 would scarcely believe them to be the same plant. I feel assured now 

 they are different ages of the same species, though my first impression 

 was that Mr. Luja's plants were unnamed. 



HEXAGONA DERMATIPHORA (Fig. 388) .Another species 

 sent by Edouard Luja, Congo Beige, has the surface covered with a 

 thin, compact, isabelline, velutinate film, such as is found in no other 

 species. It might also be sought in the section Velutinus. but its other 

 characters are so close to Hexagona tennis tha*t it is usually better 



Fig. 388 

 Hexagona dermatiphora. 



placed there. This covering disappears, or more properly is not de- 

 veloped, near the margin. The thickness, color, context, and pores 

 are the same as those of Hexagona tenuis ; in fact it might be classed 

 as a form of this species. The pores are small, regular, with thin walls, 

 and are dark colored, with a faint purplish cast. I would place it next 



501 



