482 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



cells are elongated and when they have reached a certain size 

 they may be divided into two cells by a longitudinal wall, and 

 thereafter the basal ends of the cells are cut off by transverse 

 walls (comp. Fig. 434 c, d). 



The whole plant is at the periphery surrounded by a very 

 thick cuticula about 20 — 25 ju thick. It is obviously lamellated 

 like Lobocolax, as described by Howe^) (Fig. 434 d). 



The apex of the projections is composed of a great number 

 of filaments packed together and diverging in all directions. 



In some of the specimens I have found some large cavities; 

 I think that these originate from lobes which have grown together, 

 because the thick cuticula, too, was partly present upon the wall 

 of these. 



Most of the specimens examined were sterile; I have found 

 only four with neutral spores, one with antheridia and five with 

 carpospores. 



The neutral spores (Fig. 435 a) are formed in the cortical 

 layer in such a w^ay that after the division of the terminal cells 

 by a longitudinal wall, as described above, one of the cells becomes 

 the mother-cell of the sporangia. This cell becomes filled with 

 dense contents and increases gradually in size. It is then divided 

 by a transverse wall into two spores. I have never found the 

 sporangia divided into more spores than two, and, as most of the 

 sporangia seemed quite mature, I feel convinced that no further 

 division takes place. The sporangia are about 30 /x long and 16 

 — 22 fi broad. They are formed over the whole surface of the 

 plant. 



In the male specimen found, the antheridial stands occur in 

 extended patches covering nearly the whole surface of the plant. 

 The epidermal cells are divided several times into thin filaments 

 composed of small roundish cells, the uppermost cells of which 

 become transformed into the antheridia and are gradually rounded 

 off and get loose (Fig. 435 b). 



The female plants found all had quite or nearly ripe carpo- 

 spores. The trichogyne or the carpogonial branch have not been 

 found at all, and I have therefore not been able to follow the de- 

 velopment of the cystocarps. But, nevertheless, I think I have 



1) Howe, M. A., The Marine Algæ of Peru (Memoirs of the Torrey Bot. 

 Club, vol. XV, 1914, p. 90). 



