62 



The middle of the thallus consists of a tissue of colourless, 

 rather poorly ramified, cell-threads which are loosely interwoven 

 (Fig. 65 E} ; the cell-threads are from 2 to 12 /j. thick and con- 

 sist of rather long and thick-walled cells. 



[((# Towards the periphery these hypha9-like cell-threads are 

 more richly ramified and here pass evenly into the radially pla- 

 ced assimilating fila- 

 ments, which are arran- 

 ged in small groups 

 (Fig. 654). They are 

 dichotomously divided, 

 moniliform, consisting 

 of oval cells which are 

 about 28 n long and of 

 about half that in 

 breadth. 



In the upper end 

 of the cell lies the chro- 

 matophore, but often it 

 fills up also more or 

 less the whole cell; it 

 is irregularly star-like, 

 consisting of numerous 

 strands which radiate 

 from the centre of the 

 cell in all directions 

 (Fig. 65 F]\ when these 

 strands meet each other 

 at the periphery of the 

 cell they grow together 

 and form a clathrate 

 layer with large and 

 numerous openings with- 

 in the cell -wall. In 



^ the central body of the 



chromatophore a pyre- 



noid is present which was densely stained by means of hsema- 

 toxyline. The structure of the chromatophore seems thus to be 

 in good agreement with that of Nemalion multifidum according 

 to WOLFE'S description ("Annals of Botany", vol. XVIII, 1904, 

 p. 610) with the exception that he has not found a pyrenoid in 

 his material. And further it also seems to agree well with that 



Fig. 65. Nemalion Schrammi (M. etS.) Bergs. 

 A, assimilative filaments with two carpogonial 

 branches (A, 140: 1). B and C, groups of car- 

 pogonial branches. (B, 160 : 1, C, 140 : 1). D, 

 cystocarp with decayed trichogyne (140 : 1). 

 E, colourless cells from the middle of the 

 thallus (140:1). F, Two assimilative cells 

 with chromatophore, pyrenoid and nucleus. 

 (250: 1). 



