400 



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



in deep water (about 12 — 15 fathoms). Cystocarps were found 

 in the month of March. 



St. Jan: Off Cruz Bay, off America Hill. 

 Geogr. Distrib.: Key West. 



5. Chrysymenia pyriformis Børgs. 



F. Børgesen, W. I. Florideæ, II, p. 187 (Botanisk Tidsskr. vol. 30, 

 1910, p. 187). 



The plant (Fig. 384) reaches a height of about 4V2 cm (the 

 largest specimen collected, the smaller ones were about two cm 



only). It is fastened to the 

 substratum, stones, shells etc., 

 by means of a rather large, 

 flat disc; from this disc, one 

 or more, erect shoots grow 

 up. The stem of these erect 

 shoots is terete and solid. It 

 bears the swollen, hollow and 

 short shoots (Fig. 385). The 

 shape of these is obovate- 

 pyriform reaching a length of 

 about 8 mm and a breadth 

 of 5 mm. 



The plant is, when living, 

 somewhat translucent. The 

 colour is red with a yellow- 

 brown tinge. With the excep- 

 tion of the stem, which is firmer, it is of a rather soft and slimy 

 consistency and adheres strongly to the paper. 



As to the anatomy of the thallus, we find the wall of the 

 vesicles consisting of a layer of large cells (Fig. 386 A) which on 

 their outer side are covered more or less completely by a layer 

 of small cells (Fig. 386 B). Seen from the surface the innermost 

 large cells show themselves to be roundish polygonal (Fig. 386 

 B, C). Above the transverse walls of the large cells, where some 

 more space is left on account of the somewhat curved surface 

 of these cells, we find a row of roundish cells and from these again 

 smaller and smaller roundish cells grow horizontally out over 

 the surface of the large wall-cells (Fig. 386 B). In younger vesicles 



Fig. 384. Chrysymenia pyriformis Borgs. 

 About natural size. 



