86 



several specimens preserved in alcohol; when these are put in 

 water they soon become turgescent and seem to assume quite the 

 habit of the living plant. These specimens have shown themselves 

 quite terete (Fig. 93). As far as I remember the living specimens 

 were also terete. 



Normally the thallus is not constricted but in the lowermost 

 older part of the plant narrowings are found rather often. These 

 are, however, scarcely quite normal, it seems rather as if they ori- 

 ginated from some kind of damage, 

 parts of the thallus having been cut 

 off and young thin filaments having 

 grown up from the older and broader 

 ones and in this way giving rise to the 

 constrictions. 



As to the axial strand this was 

 quite distinct through the whole thal- 

 lus in the specimens preserved in spirit 

 (Fig. 93), with the exception of the 

 lowermost part quite near the base 

 where the tissue of the plant is more 

 compact and less translucent; in the 

 dried specimens on the other hand it 

 was not visible. It consists of about 

 20 30 broader filaments with propor- 

 tionally tkick walls. 



The shape of the epidermal cells 

 (compare Fig. 94) seems to agree exactly 

 with the description of SETCHELL; 

 they are flattened or a little convex 

 at the upper (outer) end, closely 

 packed, 3 Ggonal in surface view, 

 in section quadratic to flattened rect- 

 angular, about 22 38 /j. broad and 2430^ high. 



Below the epidermal cells the cells with chromatophores form 

 together a very loose cell-layer most of the cells being quite free 

 with large open intervals between them. To judge from SETCHELL'S 

 description and figures the cells in my plant seem to be more 

 elongated pyriform than those in his plant (compare Fig. 94 a). 



The shape and the arrangement of the cystocarps appears to 

 be in good accordance with the description of SETCHELL; the 

 cystocarps occur scattered over the whole surface of the frond 

 (Fig. 93) and are globular to pyriform in shape, narrowed abruptly 



Fig. 93. Scinaia complanata 

 (Collins) Cotton, var. interme- 

 dia nov. var. Part of a plant 

 with cystocarps. (About 2:1). 



