107 



seemingly by the formation of a terminal hyaline hair. The hair had usually dis- 

 appeared, leaving only a faint scar, in some few cases it was still visible (tig. 35 B). 

 The principal filaments consist in their lower part of short cells, about twice as 

 long as broad; upwards the filaments become gradually somewhat thinner, and the 

 cells at the same time longer. On the whole, the filaments are not much branched. 

 Owing to the defective state of preservation of the material I have not been able 

 to determine with 

 certainty the form 

 of the chromato- 

 phore. In some 

 cases, however, I 

 have seen that it 

 is parietal, and I 

 suppose it to be 

 single and to have 

 one parietal pyre- 

 noid. 



The position 

 of the sporangia is 

 somewhat variable; 

 they occur mostly 

 in the upper part 

 of the plant and 

 are relatively often 

 placed singly, more 

 rarely two togeth- 

 er on unicellular 

 branchlets, or they 

 are, though rarely, 

 sessile on the fila- 

 ments. Sometimes 

 a greater number is 

 placed on somewhat 

 larger, often bran- 

 ched branchlets, but 



such branchlets grade evenly to the long filaments. The sporangia-bearing branch- 

 lets show usually no distinct arrangement on the filaments. 



The species is perhaps related to Ch. Thiiretii; it differs from it by the op- 

 posite branches and the small sporangia. 



Localit}'. Lf; MA in Nissum Bredning, 5 meters, on Desmarestia aciileata. 



Fig. 35. 



Chantransia attenuata. A, plant the basal layer of which is seen from the under face. 

 350:1. B and C, upper ends of filaments with sporangia. 560 ; 1. 



14* 



