— 182 — 



nected, forming an opening. In this young stage the cells in the 

 middle of the vesicle are very loosely connected having often some 

 prolongations and thus appearing nearly stellate but during the con- 

 tinued growth the membrane cells take a roundish — polygonal 

 form and quite coalesce. 



The gland cells are very early developed in the quite young 

 leaf. The filaments in the interior towards the cavity are, in the 

 species where they occur, a secondary formation and cannot in 

 any case be compared with the gland-bearing ones occurring in 

 Lomentaria, Champia and Chylodadia. 



Chrysymeuia Agardliii Harv. 



Harvey, "Nereis Bor.-Americana", p. 189, tab. XXX, A. 

 Only a few specimens of this species Avere found. The thallus is 



Fig. 2. Chrysymenia Af/ardhii Harv. 



A, membrane-cells seen from the innerside; the cell to the left with glands (70: 1). B, transverse 



section of the membrane; the cell in the middle with a gland (70: 1). C, part of a cell with 



glands (170:1). D, tetrasporangia in the bark-layer (170:1). 



flat, compressed, but here and there openings are present between the 

 innermost large membrane-cells. These cells are oblong-oval when 

 seen from the surface (Fig. 2^.), in transverse section irregularly 

 polygonal (Fig. 2 J^.). Towards the surface we find a dense layer of 

 small bark-cells quite covering the underlying large cells. On the 

 inside towards the small cavites here and there one of the mem- 

 brane-cells bears 2—4 (seldom more) gland-cells (Fig. ^ A.) These 

 are circular when seen from the top, often somewhat cap-like when 

 .seen from the side (Fig. 2 C). 



Here we also find hyphae-like filaments growing out from 



