183 



and taper evenly to the sum- 

 mit where often the diameter 

 scarcely reaches half the 

 length of the above mentioned 

 size. In the basal part the 

 colour of the dried specimens 

 is a ligth red-violet, towards 

 the top almost white with a 

 blue-violet tinge. 



The branches are spread- 

 ing, the angle of the dicho- 

 tomy being mostly obtuse, 

 though sometimes acute. 

 The joints are long, often Fig. 171. Amphiroa rigida Lamx. var. 

 rparhino- a Ipno-th of more Antillana nov. var. Part of a regularly 



dichotomous thallus. (About 2 : 1). 

 than one cm., cylindrical, and 



in their upper end, bifurcate, the nodes often (not always) occurring 

 at rather a long distance above the dichotomy, one or sometimes 



even 2 mm. above it. In the 

 upper end of the frond the 

 dichotomy often does not 

 occur, but the filaments are 

 divided by nodes in a similar 

 way as that found in the 

 ramified parts of the thallus. 

 Of the illustrations I have 

 seen of this species my plant 



seems to come nearest to the 

 above mentioned figure of 

 ZANARDINI (Fig. B 1), but the 

 ends of the branches of my 

 plant are less tapering and 

 not so curved as the ones in 

 ZANARDINI'S figure. 



From SOLMS - LAUBACH'S 



Fig. 172. Amphiroa rigida Lamx. var. description (1. C. p. 7) my 

 Antillana nov. var Part of a more plant geems to fatter some- 

 irregularlv ramified thallus. About 2:1). . 



what. He says: Sie zeich- 



nen sich durch unregelmassige Verzweigung und durch spitzwink- 

 lige, wenig divergente Richtung der Aeste aus, daher denn stets 

 kompakte dichte Rasen gebildet werden". As described above 



