193 



To the description given by Pi ccone I may here add the following. 

 The membrane consists of a layer of rather large oblong-rectangu- 

 lar cells when seen from the surface (Fig. 12i), -E), more roundish- 

 quadrangular in transverse section (Fig. 12 ^, 5, C). Towards the 



Fig. 12. Coelarthrnni Albertisii (Piccone) nob. 



A, transverse section of a joint at the apex of the thallus (about 10 : 1). B, C, transverse 

 sections of the membrane, B with a gland, C with tetraspores (70 : 1). D, membrane of 

 the thallus seen from the inner side (70 : 1). £, do, with glands (150 : 1). F, the membrane 

 seen from the surface showing also the underlying cells (150 : 1). G, part of the bark- 

 layer with tetraspores (150 : 1). 



surface they are covered by a bark-layer; this consists of oval- 

 roundish cells forming a more or less dense cover. Where the 

 large rounded membrane-cells touch each other and where there 

 is some free space we have over the cross-wall some larger cells 

 (Fig, 12 F) and from these smaller ones grow out over the surface 



Botanisk Tidsskrift. 30. Bind. 13 



